I have a procedure where I pass temporary table name as parameter. For each dataset inside I need to get rowcount. How to achieve this?
I need something like:
CREATE PROCEDURE sp_processing
#temp_table_name varchar(50)
AS
DECLARE #log varchar(max)
/* get list of keys inside temp_table_name */
/* just a pseudo-code example */
SET #l_cursor = CURSOR FOR
SELECT Key1, Key2, Key3, count(*)
FROM #temp_table_name -- table name passed as text
GROUP by Key1, Key2, Key3;
WHILE "there are results"
BEGIN
#log += #Key1 +', '+ #Key2 +', '+ #Key3 +', '+ #count + CHAR(13)+CHAR(10);
END
UPDATE log_table SET log_column = #log WHERE....;
END /* procedure */
Is there a way to loop this?
I know I have option to fetch results to a table type and THEN loop, but that requires to use a table type, so wondering if this is achievable without a table variable.
EDIT: I need just need to print count for each set of keys.
This worked for me:
DECLARE #l_sql nvarchar(max)
DECLARE #temp_table_name varchar(50) = 'SOME_TABLE'
DECLARE #combinedString varchar(max)
SET #l_sql = 'SELECT #combinedString = COALESCE(#combinedString, '''') + convert(varchar,[Key1]) +'', ''+ convert(varchar,[Key3]) +'': ''+ convert(varchar,COUNT(*)) + ''| '' + CHAR(13)+CHAR(10) '
+ ' FROM ' + #temp_table_name
+ ' GROUP BY [Key1], [Key3]'
+ ' ORDER BY [Key1], [Key3]';
EXECUTE sp_executesql #l_sql, N'#combinedString varchar(max) OUTPUT', #combinedString = #combinedString OUTPUT ;
SELECT #combinedString
Result:
1, 1: 4|
1, 2: 2|
1, 3: 1|
2, 5: 1|
You should always try to avoid looping and cursor. This is a set based solution for your case. Please review (specially the update filter) and see if it suits your needs.
CREATE PROCEDURE sp_processing
#temp_table_name varchar(50)
AS
BEGIN
DECLARE #DynamicSQL VARCHAR(MAX) = '
;WITH LogRecords AS
(
SELECT
LogRecord =
ISNULL(T.Key1, '''') + '','' +
ISNULL(T.Key2, '''') + '','' +
ISNULL(T.Key2, '''') + '','' +
CONVERT(VARCHAR(20), COUNT(1))
FROM
QUOTENAME(''' + #temp_table_name + ''') AS T
GROUP BY
T.Key1,
T.Key2,
T.Key3
)
UPDATE L SET
log_column = STUFF(
(
SELECT
R.LogRecord + CHAR(13) + CHAR(10)
FROM
LogRecords AS R
FOR XML
PATH('')
),
1, 1, '')
FROM
log_table AS L
WHERE
L.IdFilter = 999999999'
PRINT #DynamicSQL
-- EXEC (#DynamicSQL)
END
Related
I have a table with records which has 100 columns, I need to get the count of distinct values of all the columns from this table based on some condition (where clause).
Below query is working fine, but I'm not able to use the where clause. So it's giving the result for all the records of the table. But I want it to be based on some condition lets say column file_id = 1;. My question is how to use where clause with the below query. Or if there is any other alternative way to solve this problem.
declare #SQL nvarchar(max)
set #SQL = ''
;with cols as (
select Table_Schema, Table_Name, Column_Name, Row_Number() over(partition by Table_Schema, Table_Name
order by ORDINAL_POSITION) as RowNum
from INFORMATION_SCHEMA.COLUMNS
)
select #SQL = #SQL + case when RowNum = 1 then '' else ' union all ' end
+ ' select ''' + Column_Name + ''' as Column_Name, count(distinct ' + quotename (Column_Name) + ' ) As DistinctCountValue,
count( '+ quotename (Column_Name) + ') as CountValue FROM ' + quotename (Table_Schema) + '.' + quotename (Table_Name)
from cols
where Table_Name = 'table_name' --print #SQL
execute (#SQL)
I am using the dynamic query because I need to reuse this query for other tables also.
First get the columns and use stuff to generate the select in this way:
SELECT COUNT(ColumnA) AS ColumnA, COUNT(ColumnB AS ColumnB), COUNT(ColumnC) AS ColumnC....
That way you only select on your table once to get all counts, After that, use CROSS APPLY to "unpivot" those columns and return the output on one row per column
CROSS APPLY(
VALUES(1, 'ColumnA', ColumnA), (2, 'ColumnB', ColumnB), (3, 'ColumnC', ColumnC)
)(ID, ColumnName, DistinctCountValue)
For the filter, use sp_executesql and send the file_id as parameter
exec SP_executesql #SQL, N'#FID INT', #FID = #FileID
Since you are using all columns of the table Row_Number() over(partition by Table_Schema, Table_Name order by ORDINAL_POSITION) as RowNum becomes redundant, ORDINAL_POSITION already has the value that you are looking for
declare #tablename nvarchar(50) = 'MyTestTable'
declare #fileID int = 1
declare #SQL nvarchar(max)
set #SQL = ''
;with cols as (
select TABLE_SCHEMA, TABLE_NAME, COLUMN_NAME, ORDINAL_POSITION
from INFORMATION_SCHEMA.COLUMNS
where TABLE_NAME = #TableName
)
select #SQL = ';WITH CTE AS (SELECT
' +
STUFF((
SELECT ', COUNT(DISTINCT ' + QUOTENAME(COLUMN_NAME) + ') AS ' + QUOTENAME(COLUMN_NAME)
FROM cols
ORDER BY ORDINAL_POSITION
FOR XML PATH('')
), 1, 1, '')
+ '
FROM ' + #TableName + '
WHERE File_ID = #FID
)
SELECT B.*
FROM CTE
CROSS APPLY (
VALUES ' +STUFF((
SELECT ',( ' + CAST(ORDINAL_POSITION AS VARCHAR) + ',' + QUOTENAME(COLUMN_NAME,'''') + ',' + QUOTENAME(COLUMN_NAME) + ')'
FROM cols
ORDER BY ORDINAL_POSITION
FOR XML PATH('')
), 1, 1, '') + '
)B (ID,ColumnName,DistinctCountValue)
'
from cols
exec SP_executesql #SQL, N'#FID INT', #FID = #FileID
The query below creates a table of all the column names and uses a while loop to select the count for whatever WHERE clause you want to use. This should be pretty flexible for any table; just update the top variables. Note that this will not count a column where its value is null. You can add a case to the #Query parameter if that's what you want. Since it processes each row individually, I added in a temp table so you only hit the db once.
IF OBJECT_ID('tempdb..##SourceValues') IS NOT NULL
DROP TABLE ##SourceValues
DECLARE #Schema VARCHAR(50) = 'SomeSchema'
DECLARE #Table VARCHAR(50) = 'SomeTable'
DECLARE #WhereClause VARCHAR(MAX) = ' Some WHERE clause'
DECLARE #ColumnName VARCHAR(50)
DECLARE #ProcessedRows TABLE(ColumnName VARCHAR(50), DistinctCount INT)
DECLARE #Columns TABLE(RowNumber INT, ColumnName VARCHAR(100))
INSERT INTO #Columns SELECT ROW_NUMBER() OVER(ORDER BY COLUMN_NAME DESC), COLUMN_NAME FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME = #Table
DECLARE #Count INT = (SELECT MAX(RowNumber) FROM #Columns)
DECLARE #Counter INT = 0
DECLARE #DistinctCount INT
DECLARE #Query NVARCHAR(MAX)
EXEC('SELECT * INTO ##SourceValues FROM ' + #Table +' (NOLOCK)')
WHILE #Counter < #Count
BEGIN
SET #Counter += 1
SET #ColumnName = (SELECT ColumnName FROM #Columns WHERE RowNumber = #Counter)
SET #Query = 'SELECT #OutPut = COUNT(' + #ColumnName + ') FROM ' + #Schema + '.' + ' ##SourceValues ' + #WhereClause
EXECUTE sp_executesql #Query, N'#Output INT OUT', #DistinctCount OUT
INSERT INTO #ProcessedRows(ColumnName, DistinctCount) VALUES (#ColumnName, #DistinctCount)
END
SELECT * FROM #ProcessedRows
Let's try some different approach.
Get all values unpivoted as Param/Value:
1) Collect list of tables and columns to be used in dynamic SQL:
DROP TABLE IF EXISTS #Base;
;WITH SchemaData AS (
SELECT t.name AS [TableName],c.name AS [ColumnName],c.column_id AS [ColumnOrderID]
FROM sys.tables t
INNER JOIN sys.columns c ON c.object_id = t.object_id
)
SELECT t.TableName
,STUFF((SELECT ',CONVERT(NVARCHAR(MAX),' + QUOTENAME([ColumnName]) + ') AS ' + QUOTENAME([ColumnName])
FROM SchemaData a WHERE (a.TableName = t.TableName) FOR XML PATH(''),TYPE).value('(./text())[1]','NVARCHAR(MAX)'),1,1,'') AS [SelectClause]
,STUFF((SELECT ',' + QUOTENAME([ColumnName]) FROM SchemaData a WHERE (a.TableName = t.TableName) FOR XML PATH(''),TYPE).value('(./text())[1]','NVARCHAR(MAX)'),1,1,'') AS [UnpivotClause]
INTO #Base
FROM SchemaData t
GROUP BY t.TableName
;
2) Get all data inside a temp table
DROP TABLE IF EXISTS #Result;
CREATE TABLE #Result(TableName NVARCHAR(255),ColumnName NVARCHAR(255),[Value] NVARCHAR(MAX));
DECLARE #TableName NVARCHAR(255),#SelectClause NVARCHAR(MAX),#UnpivotClause NVARCHAR(MAX);
DECLARE crPopulateResult CURSOR LOCAL FAST_FORWARD READ_ONLY FOR SELECT b.TableName,b.SelectClause,b.UnpivotClause FROM #Base b;
OPEN crPopulateResult;
FETCH NEXT FROM crPopulateResult INTO #TableName,#SelectClause,#UnpivotClause;
DECLARE #dSql NVARCHAR(MAX);
WHILE ##FETCH_STATUS = 0
BEGIN
SELECT #dSql = N' INSERT INTO #Result(TableName,[ColumnName],[Value])
SELECT up.TableName,up.Param AS [ColumnName],up.[Value]
FROM (
SELECT ''' + #TableName + N''' AS [TableName]
,' + #SelectClause + N'
FROM ' + QUOTENAME(#TableName) + N'
) a
UNPIVOT(Value FOR Param IN (' + #UnpivotClause + N')) up
';
EXEC sp_executesql #stmt = #dSql;
FETCH NEXT FROM crPopulateResult INTO #TableName,#SelectClause,#UnpivotClause;
END
CLOSE crPopulateResult;
DEALLOCATE crPopulateResult;
3) Any filters can be applied with #Results, including Table names, column names, data filters, etc:
SELECT r.TableName,r.ColumnName,COUNT(*) AS [CountValue],COUNT(DISTINCT r.[Value]) AS [DistinctCountValue]
FROM #Result r
--
--WHERE r.ColumnName = 'file_id' AND r.[Value] = '1'
--
GROUP BY r.TableName,r.ColumnName
ORDER BY r.TableName,r.ColumnName
;
To use this with a where clause with this query you just have to put the where clause in the construction after the table name so if you wanted to filter on file_id='1' then you would have:
FROM ' + quotename (Table_Schema) + '.' + quotename (Table_Name) +'where file_id =''1'' '
You can add a #where variable and concatenate that with your big union construction (as part of your select ... from cols). For example:
declare #SQL nvarchar(max)
declare #where nvarchar(max) = ' where file_id = 1'
set #SQL = ''
;with cols as (
select Table_Schema, Table_Name, Column_Name, Row_Number() over(partition by Table_Schema, Table_Name
order by ORDINAL_POSITION) as RowNum
from INFORMATION_SCHEMA.COLUMNS
)
select #SQL = #SQL + case when RowNum = 1 then '' else ' union all ' end
+ ' select ''' + Column_Name + ''' as Column_Name, count(distinct ' + quotename (Column_Name) + ' ) As DistinctCountValue,
count( '+ quotename (Column_Name) + ') as CountValue FROM ' + quotename (Table_Schema) + '.' + quotename (Table_Name)
+ #where
from cols
where Table_Name = 'table_name' --print #SQL
execute (#SQL)
Note that you'll need to escape single quotes in #where if you're searching for a string. For example, declare #where nvarchar(max) = ' where state = ''CT'''.
I need to select all unique values from all columns in a table.
I have tried to implement the query below which I found in the thread How to get unique values from all columns of a table in SQL Server.
declare #Sql_Str varchar(8000)='';
select #Sql_Str=#Sql_Str+' select cast (' +name +' as varchar(500))
from <yourtable> union'
from sys.columns
where [object_id]=object_id('<yourtable>');
set #Sql_Str=SUBSTRING(#Sql_Str,1,len(#Sql_Str)-6);
exec(#Sql_Str)
I cannot get that query to work however. My table has 118 columns. I think that may be more data than the query above may handle.
Try something like this:
DECLARE #Schema VARCHAR(500)='dbo';
DECLARE #tableName VARCHAR(500)='SomeTable';
DECLARE #cmd NVARCHAR(MAX)=
(
SELECT STUFF(
(
SELECT ' UNION ALL SELECT ''' + c.TABLE_SCHEMA + ''' AS TableSchema '
+ ',''' + c.TABLE_NAME + ''' AS TableName '
+ ',''' + c.COLUMN_NAME + ''' AS ColumnName '
+ ',''' + c.DATA_TYPE + ''' AS ColumnType '
+ ',CAST(' + QUOTENAME(c.COLUMN_NAME)+' AS NVARCHAR(MAX)) AS Value '
+ ' FROM ' + QUOTENAME(c.TABLE_SCHEMA) + '.' + QUOTENAME(c.TABLE_NAME)
+ ' WHERE ' + QUOTENAME(c.COLUMN_NAME) + ' IS NOT NULL '
+ ' GROUP BY ' + QUOTENAME(c.COLUMN_NAME) + ' '
FROM INFORMATION_SCHEMA.COLUMNS AS c
WHERE TABLE_NAME=#TableName
AND TABLE_SCHEMA=#Schema
--exclude not supported types
--AND c.DATA_TYPE NOT IN('xml') --add more types
FOR XML PATH(''),TYPE
).value('.','nvarchar(max)'),1,10,'')
);
--PRINT #cmd
EXEC(#cmd);
This statement will first create a long list of UNION ALL SELECT with GROUP BY (better than DISTINCT) as dynamically created SQL and executes this with EXEC().
You can decomment PRINT to examine the statement created.
This should work in tSQL:
declare #table_name varchar(55)
set #table_name= 'IV00101' ---- <-- Change this to your table name
create table #colcount (
colname varchar(55),
dct int,
tot int
)
create table #colContent (
colname varchar(55),
col_val nvarchar(max),
col_val_count int
)
create table #sqlexecs( s varchar(max))
declare #col_name varchar(max), #sql nvarchar(max), #sql2 nvarchar(max)
declare c cursor for
select name from sys.columns where [object_id]=object_id(#table_name)
open c
fetch next from c into #col_name
while ##FETCH_STATUS = 0
begin
set #sql = 'select cn.name, count(distinct '+#col_name+') as dct_numrow, count('+#col_name+') as tot_numrow from '+#table_name+' join (select name from sys.columns where name = '''+#col_name+''' and [object_id]=object_id('''+#table_name+''')) cn on cn.name = '''+#col_name+''' group by cn.name'
set #sql2 = 'select ' +#col_name+', count('+#col_name+') as colvalcnt from '+#table_name+' group by '+#col_name
--insert into #sqlexecs values (#sql) --uncomment to view sql selects produced by #sql
--insert into #sqlexecs values (#sql2) --uncomment to view sql selects produced by #sql2
insert into #colcount execute sp_executesql #sql
------
declare #d int, #t int
set #d = (select dct from #colcount where colname = #col_name)
set #t = (select tot from #colcount where colname = #col_name)
if (#d <> #t)
begin
insert into #colContent (colname) values (#col_name)
insert into #colContent (col_val,col_val_count) execute sp_executesql #sql2
end
else
begin
insert into #colContent values (#col_name,1,1)
end
fetch next from c into #col_name
end
close c
deallocate c
--select * from #sqlexecs -- uncomment to view sql code produced by #sql and #sql2
select * from #colcount --order by dct desc
select * from #colContent
drop table #colcount
drop table #colContent
drop table #sqlexecs
The first table shows column name, distinct value count, and total value count.
The second table shows column name, distinct values, and the number of times a distinct value appears. If values in column are all distinct (column is a candidate key), colname | 1 | 1 is shown. This should work if copy/pasted, please let me know it doesn't. Dev for use in Dynamics GP.
I wonder that;
in SQl, is it possible to not bring the columns which have no data (or zero value)?
Select * from PLAYER_TABLE where PLAYER_NAME='cagri'
it is bringing just 1 row. because there is only one player which PLAYER_NAME is "cagri".
And there are 30 columns for example statistics.
Score-Rebound-PlayedMinutes-Fauls etc....
Score=2
Rebound=0
PlayedMinutes=2
Fauls=0
and I want to see only [Score] and [PlayedMinutes] columns when call my query.
is it possible?
You can use this logic over a stored procedure in SQL
DDL
create table usr_testtable
(player varchar(30),col1 float, col2 float, col3 float, col4 float)
insert into usr_testtable
values ('Jordan',10,20,3,0)
Convert to Stored Proc
declare #playername varchar(30) = 'Jordan' --- pass this value
declare #ctr smallint = 2 -- start from ordinal 2
declare #maxctr smallint = (SELECT max(ORDINAL_POSITION)
FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_NAME = 'usr_testTable')
declare #columns varchar(max) = ''
declare #columnswithvalues varchar(max) = ''
declare #coltocheck varchar(30)
declare #mysql nvarchar(max)
declare #coloutput varchar(30)
while #ctr <= #maxctr
begin
SELECT #coltocheck = COLUMN_NAME
FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_NAME = 'usr_testTable'
and ORDINAL_POSITION = #ctr
set #mysql = N'select #output = ' + #coltocheck + ' from usr_testTable where player =''' + #playername + ''' and cast(' + #coltocheck +' as float) > 0'
EXECUTE sp_executesql #mysql,N'#output int OUTPUT',#output = #coloutput OUTPUT;
if #coloutput > 0
begin
set #columns = coalesce(#columns + ',' + #coltocheck,#columns)
set #columnswithvalues = coalesce(#columnswithvalues + char(13) + char(10) + #coltocheck + ' : ' + #coloutput,#columnswithvalues) --- text form
end
set #coloutput = ''
set #ctr= #ctr + 1
end
-- final result in table format
set #mysql = N'select player' + #columns + ' from usr_testTable where player =''' + #playername + ''' '
EXECUTE sp_executesql #mysql
-- final result in text format appended with columnname
select #columnswithvalues -- format to display in text
First create dynamic SQL to select all columns names in the table PLAYER_TABLE except PLAYER_NAME, then unpivot data from PLAYER_TABLE into table PLAYER_TABLE1, then you can search values <> 0 and select this column in second dynamic SQL.
DROP TABLE PLAYER_TABLE1
DECLARE #Player NVARCHAR(50);
DECLARE #columns NVARCHAR(max);
DECLARE #sql NVARCHAR(max);
DECLARE #columns2 NVARCHAR(max);
DECLARE #sql2 NVARCHAR(max);
SET #player='cagri'
SET #columns = Stuff((SELECT ','
+ Quotename(Rtrim(Ltrim(x.columns)))
FROM (SELECT COLUMN_NAME as columns FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME= 'PLAYER_TABLE' and COLUMN_NAME<>'PLAYER_NAME' ) AS x
ORDER BY X.columns
FOR xml path('')), 1, 1, '');
SET #sql = N' SELECT
PLAYER_NAME, Un_Pivot.Field, Un_Pivot.Value
INTO PLAYER_TABLE1
FROM
(
SELECT * FROM PLAYER_TABLE
) Data
UNPIVOT
(
Value FOR Field IN ('+#columns+')
) AS Un_Pivot';
EXECUTE sp_executesql #sql;
SET #columns2 = Stuff((SELECT ','
+ Quotename(Rtrim(Ltrim(y.Field)))
FROM (SELECT Field FROM PLAYER_TABLE1 WHERE VALUE<>0 AND PLAYER_NAME=#Player) AS y
ORDER BY y.Field
FOR xml path('')), 1, 1, '');
SET #sql2 = N'SELECT PLAYER_NAME,'+#columns2+'FROM PLAYER_TABLE WHERE PLAYER_NAME='+char(39)+#Player+char(39);
EXECUTE sp_executesql #sql2
This solution is for an unbounded Gridview paging and having problem with the syntax of this query:
> #currTable varchar(20),
#startRowIndex int,
#maximumRows int,
#totalRows int OUTPUT
AS
DECLARE #first_id int, #startRow int
IF #startRowIndex = 1
SET #startRowIndex = 1
ELSE
SET #startRowIndex = ((#startRowIndex - 1) * #maximumRows)+1
SET ROWCOUNT #startRowIndex
DECLARE #sql varchar(250);
SET #sql = 'SELECT ID, StringID_from_Master, GUID, short_Text, lang_String, date_Changed, prev_LangString, needsTranslation, displayRecord, brief_Descrip FROM ' + #currTable + ' ';
EXECUTE(#sql);
PRINT #first_id
SET ROWCOUNT #maximumRows
SELECT #sql = 'SELECT ' + CAST(#first_id as varchar(20)) + ' = ID FROM ' + QUOTENAME(#currTable) + ' ORDER BY ID ' ;
EXEC (#sql);
SET ROWCOUNT 0
-- Get the total rows
SET #sql = 'SELECT ' + + CAST(#totalRowsas varchar(20)) + ' = COUNT(ID) FROM ' + #currTable + ' ';
EXECUTE(#sql);
RETURN
<
The errors is:
Conversion failed when converting the varchar value ''SELECT ' to data type int.
Tried also
nvarchar and varchar. = + CAST(#first_id as varchar(10)) +
If you're trying to implement paging, this is wrong in so many ways. First, you're using SET ROWCOUNT to limit to #startRowIndex, but then you're selecting ALL n rows (with no ORDER BY), then getting the first ID, then counting the total rows by selecting from the table? Might I suggest a better approach?
CREATE PROCEDURE dbo.PageSmarter
#Table NVARCHAR(128), -- table names should not be varchar(20)
#FirstRow INT,
#PageSize INT,
#TotalRows INT OUTPUT
AS
BEGIN
SET NOCOUNT ON; -- always, in every stored procedure
DECLARE
#first_id INT,
#startRow INT,
#sql NVARCHAR(MAX);
SET #sql = N'WITH x AS
(
SELECT
ID,
rn = ROW_NUMBER() OVER (ORDER BY ID)
FROM
' + #Table + '
)
SELECT rn, ID
INTO #x FROM x
WHERE rn BETWEEN ' + CONVERT(VARCHAR(12), #FirstRow)
+ 'AND (' + CONVERT(VARCHAR(12), #FirstRow)
+ ' + ' + CONVERT(VARCHAR(12), #PageSize) + ' - 1);
SELECT first_id = MIN(ID) FROM #x;
SELECT
ID, StringID_from_Master, GUID, short_Text, lang_String, date_Changed,
prev_LangString, needsTranslation, displayRecord, brief_Descrip
FROM ' + #Table + ' AS src
WHERE EXISTS
(
SELECT 1 FROM #x
WHERE ID = src.ID
);';
EXEC sp_executeSQL #sql;
SELECT #totalRows = SUM(row_count)
FROM sys.dm_db_partition_stats
WHERE [object_id] = OBJECT_ID(#Table);
END
GO
DECLARE #tr INT;
EXEC dbo.PageSmarter 'dbo.tablename', 10, 2, #tr OUTPUT;
SELECT #tr;
I haven't tested all edge cases with this specific implementation. I will confess, there are much better ways to do this, but they usually aren't complicated with the additional requirement of dynamic table names. This suggests that there is something inherently wrong with your design if you can run the exact same queries against any number of tables and get similar results.
In any case, you can review some of the (quite lengthy) discussion about various approaches to paging over at SQL Server Central:
http://www.sqlservercentral.com/articles/T-SQL/66030/
There are 62 comments following up on the article:
http://www.sqlservercentral.com/Forums/Topic672980-329-1.aspx
I am guessing your #first_id field is an int. If so, then you need to CAST/Convert your #first_id value to a string/varchar.
CAST(#first_id as varchar(10))
or
Convert(varchar(10), #first_id)
MSDN documentation on CAST/Convert for SQL server
EDIT: After looking at your query again, I notice that you are setting your #first_id = ID, This is incorrect syntax, the correct syntax would be below.
SELECT #sql = 'SELECT ID AS ' + CAST(#first_id as varchar(10)) + ' FROM ' +
QUOTENAME(#currTable) + ' ORDER BY ID ' ;
EXEC (#sql);
It appears you're trying to create an alias for your column ID. The string you're building won't result in a valid SQL statement if it contains a number. It would come out to something like this:
SELECT 123 = ID FROM dbo.MyTable ORDER BY ID
Try this:
SELECT ID AS '123' FROM dbo.MyTable ORDER BY ID
To achieve that:
SELECT #sql = 'SELECT ID AS ''' + CAST(#first_id as varchar(10)) +
''' FROM ' + QUOTENAME(#currTable) +
' ORDER BY ID ' ;
I would do it this way
create table #e (a int)
SET #sql = 'insert #e SELECT COUNT(ID) FROM ' + #currTable + ' ';
exec(#sql)
select #totalRows = a from #e
drop table #e
I am using SQL Server 2008. I use to take the script of my data from SQL table using Tasks --> Generate Scripts option.
Here is my problem:
Let's say I have 21,000 records in Employee table. When I take the script of this table, it takes the insert script for all 21000 records. What is the solution if I want to take only the script of 18000 records from the table?
Is there any solution using SQL query or from the tasks wizard?
Thanks in advance...
Create a new View where you select your desired rows from your Employee table e.g. SELECT TOP 21000...
Then simply script that View instead of the Table.
In case the views are not an option for you I wrote the following code based on the Aaron Bertrand's answer here that will give the insert statement for a single record in the db.
CREATE PROCEDURE dbo.GenerateSingleInsert
#table NVARCHAR(511), -- expects schema.table notation
#pk_column SYSNAME, -- column that is primary key
#pk_value NVARCHAR(10) -- change data type accordingly
AS
BEGIN
SET NOCOUNT ON;
DECLARE #cols NVARCHAR(MAX), #vals NVARCHAR(MAX),
#valOut NVARCHAR(MAX), #valSQL NVARCHAR(MAX);
SELECT #cols = N'', #vals = N'';
SELECT #cols = #cols + ',' + QUOTENAME(name),
#vals = #vals + ' + '','' + ' + 'ISNULL('+REPLICATE(CHAR(39),4)+'+RTRIM(' +
CASE WHEN system_type_id IN (40,41,42,43,58,61) -- dateteime and time stamp type
THEN
'CONVERT(CHAR(8), ' + QUOTENAME(name) + ', 112) + '' ''+ CONVERT(CHAR(14), ' + QUOTENAME(name) + ', 14)'
WHEN system_type_id IN (35) -- text type
THEN
'REPLACE(CAST(' + QUOTENAME(name) + 'as nvarchar(MAX)),'+REPLICATE(CHAR(39),4)+','+REPLICATE(CHAR(39),6)+')'
ELSE
'REPLACE(' + QUOTENAME(name) + ','+REPLICATE(CHAR(39),4)+','+REPLICATE(CHAR(39),6)+')'
END
+ ')+' + REPLICATE(CHAR(39),4) + ',''null'') + '
FROM sys.columns WHERE [object_id] = OBJECT_ID(#table)
AND system_type_id <> 189 -- can't insert rowversion
AND is_computed = 0; -- can't insert computed columns
SELECT #cols = STUFF(#cols, 1, 1, ''),
#vals = REPLICATE(CHAR(39),2) + STUFF(#vals, 1, 6, '') + REPLICATE(CHAR(39),2) ;
SELECT #valSQL = N'SELECT #valOut = ' + #vals + ' FROM ' + #table + ' WHERE '
+ QUOTENAME(#pk_column) + ' = ''' + RTRIM(#pk_value) + ''';';
EXEC sp_executesql #valSQL, N'#valOut NVARCHAR(MAX) OUTPUT', #valOut OUTPUT;
SELECT SQL = 'INSERT ' + #table + '(' + #cols + ') SELECT ' + #valOut;
END
I took the above code and wrapped it the following proc that will use the where clause you give it to select which insert statements to create
CREATE PROCEDURE dbo.GenerateInserts
#table NVARCHAR(511), -- expects schema.table notation
#pk_column SYSNAME, -- column that is primary key
#whereClause NVARCHAR(500) -- the where clause used to parse down the data
AS
BEGIN
declare #temp TABLE ( keyValue nvarchar(10), Pos int );
declare #result TABLE ( insertString nvarchar(MAX) );
declare #query NVARCHAR(MAX)
set #query =
'with qry as
(
SELECT ' + #pk_column + ' as KeyValue, ROW_NUMBER() over(ORDER BY ' + #pk_column + ') Pos
from ' + #table + '
' + #whereClause + '
)
select * from qry'
insert into #temp
exec sp_sqlexec #query
Declare #i int, #key nvarchar(10)
select #i = count(*) from #temp
WHILE #i > 0 BEGIN
select #key = KeyValue from #temp where Pos = #i
insert into #result
exec [dbo].[GenerateSingleInsert] #table, #pk_column, #key
set #i = #i - 1
END
select insertString from #result
END
Calling it could look like the following. You pass in the table name, the table primary key and the where clause and you should end up with your insert statements.
set #whereClause = 'where PrettyColorsId > 1000 and PrettyColorsID < 5000'
exec [dbo].GenerateInserts 'dbo.PrettyColors', 'PrettyColorsID', #whereClause
set #whereClause = 'where Color in (' + #SomeValues + ')'
exec [dbo].GenerateInserts 'dbo.PrettyColors', 'PrettyColorsID', #whereClause