I have the below code to pull the row and column counts from each table within a database (e.g., db1). But I have several databases (e.g., db1, db2 etc.) , so manually updating the database name in the USE statement for every run isn't very convenient. Is there a way to pass a list of database names in a cursor (or something else that allows iteration) and then run the below query for every database in the list, appending the results from each run? I can get the list of database names from this query select name from master.dbo.sysdatabases where name like '%db%'.
USE [db1]
;with [rowCount] as
(
SELECT DB_NAME() as [DB_Name],
QUOTENAME(SCHEMA_NAME(sOBJ.schema_id)) + '.' + QUOTENAME(sOBJ.name) AS [TableName],
SUM(sPTN.Rows) AS [RowCount]
FROM SYS.OBJECTS AS sOBJ
INNER JOIN SYS.PARTITIONS AS sPTN
ON sOBJ.object_id = sPTN.object_id
WHERE
sOBJ.type = 'U'
AND sOBJ.is_ms_shipped = 0x0
AND index_id < 2 -- 0:Heap, 1:Clustered
GROUP BY
sOBJ.schema_id
,sOBJ.name
)
,columnCount as
(
select
QUOTENAME(col.TABLE_SCHEMA) + '.' + QUOTENAME(col.TABLE_NAME) AS [TableName],
count(*) as ColumnCount
from INFORMATION_SCHEMA.COLUMNS col
inner join INFORMATION_SCHEMA.TABLES tbl
on col.TABLE_SCHEMA = tbl.TABLE_SCHEMA
and col.TABLE_NAME = tbl.TABLE_NAME
and tbl.TABLE_TYPE <> 'view'
group by
QUOTENAME(col.TABLE_SCHEMA) + '.' + QUOTENAME(col.TABLE_NAME)
)
select r.[DB_Name], r.TableName, r.[RowCount], c.ColumnCount
from [rowCount] r
inner join columnCount c
on r.TableName = c.TableName
ORDER BY r.[TableName]
In Oracle SQL Developer, if I'm viewing the information on a table, I can view the constraints, which let me see the foreign keys (and thus which tables are referenced by this table), and I can view the dependencies to see what packages and such reference the table. But I'm not sure how to find which tables reference the table.
For example, say I'm looking at the emp table. There is another table emp_dept which captures which employees work in which departments, which references the emp table through emp_id, the primary key of the emp table. Is there a way (through some UI element in the program, not through SQL) to find that the emp_dept table references the emp table, without me having to know that the emp_dept table exists?
No. There is no such option available from Oracle SQL Developer.
You have to execute a query by hand or use other tool (For instance PLSQL Developer has such option). The following SQL is that one used by PLSQL Developer:
select table_name, constraint_name, status, owner
from all_constraints
where r_owner = :r_owner
and constraint_type = 'R'
and r_constraint_name in
(
select constraint_name from all_constraints
where constraint_type in ('P', 'U')
and table_name = :r_table_name
and owner = :r_owner
)
order by table_name, constraint_name
Where r_owner is the schema, and r_table_name is the table for which you are looking for references. The names are case sensitive
Be careful because on the reports tab of Oracle SQL Developer there is the option "All tables / Dependencies" this is from ALL_DEPENDENCIES which refers to "dependencies between procedures, packages, functions, package bodies, and triggers accessible to the current user, including dependencies on views created without any database links.". Then, this report have no value for your question.
To add this to SQL Developer as an extension do the following:
Save the below code into an xml file (e.g. fk_ref.xml):
<items>
<item type="editor" node="TableNode" vertical="true">
<title><![CDATA[FK References]]></title>
<query>
<sql>
<![CDATA[select a.owner,
a.table_name,
a.constraint_name,
a.status
from all_constraints a
where a.constraint_type = 'R'
and exists(
select 1
from all_constraints
where constraint_name=a.r_constraint_name
and constraint_type in ('P', 'U')
and table_name = :OBJECT_NAME
and owner = :OBJECT_OWNER)
order by table_name, constraint_name]]>
</sql>
</query>
</item>
</items>
Add the extension to SQL Developer:
Tools > Preferences
Database > User Defined Extensions
Click "Add Row" button
In Type choose "EDITOR", Location is where you saved the xml file above
Click "Ok" then restart SQL Developer
Navigate to any table and you should now see an additional tab next to SQL one, labelled FK References, which displays the new FK information.
Reference
http://www.oracle.com/technetwork/issue-archive/2007/07-jul/o47sql-086233.html
Replace [Your TABLE] with emp in the query below
select owner,constraint_name,constraint_type,table_name,r_owner,r_constraint_name
from all_constraints
where constraint_type='R'
and r_constraint_name in (select constraint_name
from all_constraints
where constraint_type in ('P','U')
and table_name='[YOUR TABLE]');
You may be able to query this from the ALL_CONSTRAINTS view:
SELECT table_name
FROM ALL_CONSTRAINTS
WHERE constraint_type = 'R' -- "Referential integrity"
AND r_constraint_name IN
( SELECT constraint_name
FROM ALL_CONSTRAINTS
WHERE table_name = 'EMP'
AND constraint_type IN ('U', 'P') -- "Unique" or "Primary key"
);
SQL Developer 4.1, released in May of 2015, added a Model tab which shows table foreign keys which refer to your table in an Entity Relationship Diagram format.
SELECT DISTINCT table_name,
constraint_name,
column_name,
r_table_name,
position,
constraint_type
FROM (SELECT uc.table_name,
uc.constraint_name,
cols.column_name,
(SELECT table_name
FROM user_constraints
WHERE constraint_name = uc.r_constraint_name) r_table_name,
(SELECT column_name
FROM user_cons_columns
WHERE constraint_name = uc.r_constraint_name
AND position = cols.position) r_column_name,
cols.position,
uc.constraint_type
FROM user_constraints uc
inner join user_cons_columns cols
ON uc.constraint_name = cols.constraint_name
WHERE constraint_type != 'C')
START WITH table_name = '&&tableName'
AND column_name = '&&columnName'
CONNECT BY NOCYCLE PRIOR table_name = r_table_name
AND PRIOR column_name = r_column_name;
This has been in the product for years - although it wasn't in the product in 2011.
But, simply click on the Model page.
Make sure you are on at least version 4.0 (released in 2013) to access this feature.
How about something like this:
SELECT c.constraint_name, c.constraint_type, c2.constraint_name, c2.constraint_type, c2.table_name
FROM dba_constraints c JOIN dba_constraints c2 ON (c.r_constraint_name = c2.constraint_name)
WHERE c.table_name = <TABLE_OF_INTEREST>
AND c.constraint_TYPE = 'R';
To add to the above answer for sql developer plugin, using the below xml will help in getting the column associated with the foreign key.
<items>
<item type="editor" node="TableNode" vertical="true">
<title><![CDATA[FK References]]></title>
<query>
<sql>
<![CDATA[select a.owner,
a.constraint_name,
a.table_name,
b.column_name,
a.status
from all_constraints a
join all_cons_columns b ON b.constraint_name = a.constraint_name
where a.constraint_type = 'R'
and exists(
select 1
from all_constraints
where constraint_name=a.r_constraint_name
and constraint_type in ('P', 'U')
and table_name = :OBJECT_NAME
and owner = :OBJECT_OWNER)
order by table_name, constraint_name]]>
</sql>
</query>
</item>
</items>
I like to do this with a straight SQL query, rather than messing about with the SQL Developer application.
Here's how I just did it. Best to read through this and understand what's going on, so you can tweak it to fit your needs...
WITH all_primary_keys AS (
SELECT constraint_name AS pk_name,
table_name
FROM all_constraints
WHERE owner = USER
AND constraint_type = 'P'
)
SELECT ac.table_name || ' table has a foreign key called ' || upper(ac.constraint_name)
|| ' which references the primary key ' || upper(ac.r_constraint_name) || ' on table ' || apk.table_name AS foreign_keys
FROM all_constraints ac
LEFT JOIN all_primary_keys apk
ON ac.r_constraint_name = apk.pk_name
WHERE ac.owner = USER
AND ac.constraint_type = 'R'
AND ac.table_name = nvl(upper(:table_name), ac.table_name)
ORDER BY ac.table_name, ac.constraint_name
;
Only Replace table_name with your primary table name
select *
from all_constraints
where r_constraint_name in (
select constraint_name
from all_constraints
where table_name='table_name'
);
Replace MY_OWNER_NAME and MY_TABLE_NAME below and you are ready to go RECURSIVELY:
DECLARE
FUNCTION list_all_child_tables_and_constraints(asked_table_name in VARCHAR2, parent_table_name in VARCHAR2)
RETURN VARCHAR2 IS
current_path VARCHAR2(100);
BEGIN
FOR item IN
(SELECT fk.TABLE_NAME, constraint_parent.FK FK1, constraint_child.FK FK2
FROM all_constraints fk, all_constraints pk,
(SELECT acc.CONSTRAINT_NAME, LISTAGG(acc.COLUMN_NAME, ', ') WITHIN GROUP (ORDER BY acc.COLUMN_NAME) AS FK
FROM ALL_CONS_COLUMNS acc
WHERE acc.OWNER = 'MY_OWNER_NAME'
GROUP BY acc.CONSTRAINT_NAME) constraint_parent,
(SELECT acc.CONSTRAINT_NAME, LISTAGG(acc.COLUMN_NAME, ', ') WITHIN GROUP (ORDER BY acc.COLUMN_NAME) AS FK
FROM ALL_CONS_COLUMNS acc
WHERE acc.OWNER = 'MY_OWNER_NAME'
GROUP BY acc.CONSTRAINT_NAME) constraint_child
WHERE pk.owner = fk.r_owner
AND pk.constraint_name = fk.r_constraint_name
AND fk.constraint_type = 'R'
AND pk.table_name = asked_table_name
AND constraint_parent.CONSTRAINT_NAME = fk.CONSTRAINT_NAME
AND constraint_child.CONSTRAINT_NAME = fk.R_CONSTRAINT_NAME
AND pk.owner = 'MY_OWNER_NAME'
AND fk.owner = 'MY_OWNER_NAME')
LOOP
current_path := parent_table_name || ' // ' || item.TABLE_NAME;
DBMS_OUTPUT.PUT_LINE(current_path);
DBMS_OUTPUT.PUT_LINE(' [' || item.FK1 || '] [' || item.FK2 || ']');
DBMS_OUTPUT.PUT_LINE('');
current_path := list_all_child_tables_and_constraints(item.TABLE_NAME, current_path);
END LOOP;
RETURN '-----------FINISHED-----------';
EXCEPTION
WHEN OTHERS THEN
RETURN '-----------FINISHED-----------';
END list_all_child_tables_and_constraints;
BEGIN
DBMS_OUTPUT.PUT_LINE(list_all_child_tables_and_constraints('MY_TABLE_NAME', ''));
END;
I'm learning SQL utilizing the common Microsoft AdventureWorks2014 sample database in SQL Server 2014.
I just learned about HAVING and Information Schema today and am trying to combine the two.
Reason being, I'd really like to quickly tell which columns from all tables are shared. This works:
SELECT TABLE_SCHEMA, TABLE_NAME, COLUMN_NAME
FROM INFORMATION_SCHEMA.COLUMNS
ORDER BY COLUMN_NAME, TABLE_SCHEMA
But... the output gives me unique column names that only slows me down.
I've tried applying answers from "How to select non 'unique' rows" (among 5-7 other SOF pages!) such as:
SELECT TABLE_SCHEMA, TABLE_NAME, COLUMN_NAME, COUNT(*)
FROM INFORMATION_SCHEMA.COLUMNS
GROUP BY COLUMN_NAME
HAVING COUNT(COLUMN_NAME) > 1
...but I get this error:
Msg 8120, Level 16, State 1, Line 1 Column
'information_schema.columns.TABLE_SCHEMA' is invalid in the select
list because it is not contained in either an aggregate function or
the GROUP BY clause.
You can use your query, to retrive all the columns that are shared, and then join to the original table for all the information (schema, name):
SELECT t.TABLE_SCHEMA,
t.table_name,
t.column_name
FROM INFORMATION_SCHEMA.COLUMNS t
INNER JOIN (
SELECT s.column_name
FROM INFORMATION_SCHEMA.COLUMNS s
GROUP BY s.column_name
HAVING COUNT(s.column_name) > 1
) tt ON (t.column_name = tt.column_name)
SELECT *
FROM (
SELECT
col = c.name,
obj_name = o.name,
sch_name = SCHEMA_NAME(o.[schema_id]),
col_type = TYPE_NAME(c.system_type_id),
RowNum = COUNT(1) OVER (PARTITION BY c.name, o.[type] ORDER BY 1/0)
FROM sys.columns c
JOIN sys.objects o ON c.[object_id] = o.[object_id]
WHERE o.[type] = 'U'
) t
WHERE t.RowNum > 1
ORDER BY t.col
Output:
col obj_name sch_name col_type
----------------------- ------------------- --------- ------------
dbid spt_fallback_usg dbo smallint
dbid spt_fallback_db dbo smallint
xserver_name spt_fallback_usg dbo varchar
xserver_name spt_fallback_db dbo varchar
xserver_name spt_fallback_dev dbo varchar
When I join two tables I got a collation issue that is
System.Data.SqlClient.SqlException: Cannot resolve the collation conflict between "SQL_Latin1_General_CP1_CI_AS" and "Latin1_General_CI_AI" in the equal to operation.
Then I set the collation in my db using the following code
ALTER DATABASE [CAM] COLLATE SQL_Latin1_General_CP1_CI_AS;
ALTER TABLE CAM_Users
ALTER COLUMN [EmployeeCode] VARCHAR(50)
COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL;
But I still get the same error.
My join query is this:
List<DTOUserManagement> users = (from CAMuser in _unitOfWorkAsync.RepositoryAsync<CAM_Users>().Queryable()
join QRuser in _unitOfWorkAsync.RepositoryAsync<CAM_V_EmployeeMaster>().Queryable() on CAMuser.EmployeeCode equals QRuser.EmployeeCode into t
from t1 in t.DefaultIfEmpty()
join CAMDomain in _unitOfWorkAsync.RepositoryAsync<CAM_Domain>().Queryable() on CAMuser.DomainID equals CAMDomain.DomainID into t2
from t3 in t2.DefaultIfEmpty()
where CAMuser.IsActive
select new DTOUserManagement
{
TransactUserCode = CAMuser.TransactUserCode,
EmployeeCode = CAMuser.EmployeeCode,
EmployeeName = t1.EmployeeName,
Email = t1.EMail,
DomainID = CAMuser.DomainID,
DomainName = t3.DomainName,
IsActive = CAMuser.IsActive,
AssignedRole = CAMuser.AssignedRoles
}).ToList();
How can I solve this?
Please reply anybody
The problem here is that the COLLATION must match on joining columns.
There are two ways to fix this. First you could change the collation on each column. Or second, you can change the collation at execution time. Here's an example of the second approach:
Sample Data
/* T1 and T2 are identical tables in structre and content, except
* for the collation.
*/
DECLARE #T1 TABLE
(
ID VARCHAR(3) COLLATE SQL_Latin1_General_CP1_CI_AS
)
;
DECLARE #T2 TABLE
(
ID VARCHAR(3) COLLATE Latin1_General_CI_AI
)
;
INSERT INTO #T1
(
ID
)
VALUES
('x'),
('y'),
('z')
;
INSERT INTO #T2
(
ID
)
VALUES
('x'),
('y'),
('z')
;
Anti Pattern - Will not Work
/* This query will failed with the error:
* Cannot resolve the collation conflict between "Latin1_General_CI_AI" and "SQL_Latin1_General_CP1_CI_AS" in the equal to operation.
*/
SELECT
*
FROM
#T1 AS t1
INNER JOIN #T2 AS t2 ON t1.ID = t2.ID
;
Corrected - No Error
/* Success.
*/
SELECT
*
FROM
#T1 AS t1
INNER JOIN #T2 AS t2 ON t1.ID = t2.ID COLLATE Latin1_General_CI_AI
;
You need to check your tables that are involved in these JOINs here to verify that all columns involved have the same collation.
You can do this with this SQL query:
SELECT
TableName = t.Name,
ColumnName = c.name,
Collation = c.collation_name
FROM
sys.columns c
INNER JOIN
sys.tables t ON t.object_id = c.object_id
INNER JOIN
sys.types ty ON c.system_type_id = ty.system_type_id
WHERE
t.name IN ('CAM_Users', 'CAM_Domain') -- add any further tables to check
AND ty.name IN ('char', 'nchar', 'nvarchar', 'varchar')
ORDER BY
t.name, c.name
If there are columns that do not match the database default collation, you need to change those to be the same as all other columns. Once all the string columns in those tables are the same collation, then your joins should work.
Update: use this query to find those tables & columns that do not have the current default database collation:
SELECT
TableName = t.Name,
ColumnName = c.name,
Collation = c.collation_name
FROM
sys.columns c
INNER JOIN
sys.tables t ON t.object_id = c.object_id
INNER JOIN
sys.types ty ON c.system_type_id = ty.system_type_id
WHERE
ty.name IN ('char', 'nchar', 'nvarchar', 'varchar')
AND c.collation_name <> 'SQL_Latin1_General_CP1_CI_AS'
ORDER BY
t.name, c.name
I am linking to tables in SQL Server from an MS Access front-end. There are column descriptions for some of the tables in SQL Server that I would like to bring forward when I create the linked tables in Access. Is there a way to get at the column descriptions programmatically?
(I know how to append the description to the linked tables, I just need help getting at the descriptions in the back end.)
Try something like:
DECLARE #TableName varchar(100)
SELECT #TableName = 'yourtablename'
-- This will determine if we're using version 9 (2005) of SQL Server, and execute code accordingly
IF CAST(REPLACE(SUBSTRING(CAST(SERVERPROPERTY('productversion') as varchar),1,2), '.','') as int) >= 9
BEGIN
-- This is a SQL 2005 machine
SELECT
[Table Name] = OBJECT_NAME(c.object_id),
[Column Name] = c.name,
[Description] = ex.value
FROM
sys.columns c
LEFT OUTER JOIN
sys.extended_properties ex
ON
ex.major_id = c.object_id
AND ex.minor_id = c.column_id
AND ex.name = 'MS_Description'
WHERE
OBJECTPROPERTY(c.object_id, 'IsMsShipped')=0
AND OBJECT_NAME(c.object_id) = #TableName
ORDER
BY OBJECT_NAME(c.object_id), c.column_id
END
ELSE
BEGIN
-- assume this is a SQL 2000
SELECT
[Table Name] = i_s.TABLE_NAME,
[Column Name] = i_s.COLUMN_NAME,
[Description] = s.value
FROM
INFORMATION_SCHEMA.COLUMNS i_s
LEFT OUTER JOIN
sysproperties s
ON
s.id = OBJECT_ID(i_s.TABLE_SCHEMA+'.'+i_s.TABLE_NAME)
AND s.smallid = i_s.ORDINAL_POSITION
AND s.name = 'MS_Description'
WHERE
OBJECTPROPERTY(OBJECT_ID(i_s.TABLE_SCHEMA+'.'+i_s.TABLE_NAME), 'IsMsShipped')=0
AND i_s.TABLE_NAME = #TableName
ORDER BY
i_s.TABLE_NAME, i_s.ORDINAL_POSITION
END