I have two tables in SQL Server which have two similar columns.
table1 (
partID, PartName, ....
)
table2 (
sekId, Part2Name, ....
)
I need to populate one combobox in vb.net with the cummulated values of PartName and Part2Name so that the list can appear like being sourced from one single column, because the user might require from either. The combobox must be one that's how the design has it. Is there an SQL statement to sort me out?
U get all valuel like this:
SELECT PartName FROM table1
UNION
SELECT PartName From table2
Using the UNION T-SQL statement will join the two tables togheter
SELECT partID as IDNumber, PartName as Name FROM table1
UNION
SELECT sekID as IDNumber, Part2Name as Name From table2
ORDER BY Name
and sort the union using the renamed column
Related
I'm trying to do select from Table2 for each row in an initial select statement from Table1.
Initial select statement would look something like
Select * from Table1 Where GroupID='someId' AND ObjectID='someID'
Table1 would return something like the following (there will only ever be 0-1 returned rows with a null EndDate value).
Table2 will look as follows
Basically my goal is to loop through the first select statements rows. For each row I want to take the objectid, startdate, and enddate to select all the appropriate rows in Table2. Then after do a UNION(?) on all the data I've selected from Table2. I want to be able to select all the rows in Table2 which's objectid matches the objectid given and the timestamp is in-between the start/end dates (or to current timestamp if enddate is null). Does that make sense? I've been looking online, but have not found a way to achieve a looping select union like this.
I'm not sure if this is possible in a single select statement or if a stored proc is needed/cleaner (either is fine but I'd rather avoid stored proc if I can).
You can do it with a join:
SELECT t2.*
FROM Table2 t2 INNER JOIN Table1 t1
ON t1.objectid = t2.objectid
AND t2.timestamp BETWEEN t1.startdate AND COALESCE(t1.enddate, current_timestamp)
WHERE t1.GroupID = 'someId' AND t1.ObjectID = 'someID'
Can you set multiple column names from a SQL table as a macro in SQL to query against?
For example I have multiple columns I am hitting against multiple times, can I use a macro or some type of reference to identify them ONCE to avoid displaying them repetitively and cluttering up the code?
The current code works, I am just looking for a cleaner/streamlined option.
Current Code:
WHERE ('ABC') IN
([CODE1],[CODE2],[CODE3],[CODE4],[CODE5],[CODE6],[CODE7],[CODE8]
,[CODE9],[CODE10],[CODE11],[CODE12],[CODE13],[CODE14],[CODE15]
,[CODE16],[CODE17],[CODE18],[CODE19],[CODE20],[CODE21],[CODE22]
,[CODE23],[CODE24],[CODE25]
AND ('CFS') IN
([CODE1],[CODE2],[CODE3],[CODE4],[CODE5],[CODE6],[CODE7],[CODE8]
,[CODE9],[CODE10],[CODE11],[CODE12],[CODE13],[CODE14],[CODE15]
,[CODE16],[CODE17],[CODE18],[CODE19],[CODE20],[CODE21],[CODE22]
,[CODE23],[CODE24],[CODE25]
ect...(20 more times)
Goal:
WHERE 'ABC' IN (&columnsmentionedabove)
OR 'FGS' in (&columnsmentionedabove)
OR 'g6s' in (&columnsmentionedabove)
etc.....
This is inherited code and just seems very clunky.
Thank you
Numbered columns like this are almost always a sign you should have an additional table. So if your existing table structure is like this:
Table1
Table1ID, OtherFields, Code1, Code2, Code3.... Code25
You really want something more like this:
Table1
Table1ID, OtherFields
Table1Codes
Table1ID, Code
Where each entry in Table1 will have many entries in Table1Codes. Then you write JOIN statements to show the two sets side-by-side when needed.
FROM Table1 t
INNER JOIN Table1Codes tc1 ON tc.Table1ID = t.Table1ID AND tc.Code = 'ABC'
INNER JOIN Table1Codes tc2 ON tc.Table1ID = t.Table1ID AND tc.Code = 'CFS'
Or
FROM Table1 t
INNER JOIN Table1Codes tc1 ON tc.Table1ID = t.Table1ID AND tc.Code IN ('ABC','FGS','g6s')
If you can't change the table's schema, as in often the case, you can UNPIVOT it. For example, assuming CODE1...CODE25 come from MyTable, wrap the UNPIVOT operation inside a CTE:
;WITH
cte AS
(
SELECT upvt.*
FROM MyTable
UNPIVOT (
CodeValue FOR CodeLabel IN ([CODE1], [CODE2], ..., [CODE25])
) upvt
)
SELECT *
FROM cte
WHERE CodeValue IN ('ABC', 'DEF', ...)
The unpivot operation is not free. Make sure you filter as much as possible from MyTable before unpivoting the it.
Suppose you have a table Table1 with columns
UserId, Item1, Item2, Item3, Item4, Item5, Item6, Item7, Item8, Item9, Item10
and you have another table Table2 with
UserId, ItemId, Name
. The values in Table1 is the ItemId from Table2. I have a need to display
UserId, ItemId, Name
where Item1 is 1st and Item10 is last and you have 10 rows. In other words, Item1 is 1st row and Item10 is last row. If there's any way to avoid CASE WHEN that would be great. I may have more columns in the future and would hate to hardcode the 10 columns.
I think you want a reverse pivot in this case. You don't use CASE, like you would in a normal pivot, but instead UNION ALL, like this:
select Table1.UserId, Table2.ItemId, Table2.Name
from Table1 inner join Table2 on Table1.Item1 = Table2.ItemId
UNION ALL
select Table1.UserId, Table2.ItemId, Table2.Name
from Table1 inner join Table2 on Table1.Item2 = Table2.ItemId
UNION ALL
...
select Table1.UserId, Table2.ItemId, Table2.Name
from Table1 inner join Table2 on Table1.Item10 = Table2.ItemId
If you have more items, you should also be able to write a snippet that generates the repeating UNION ALL syntax so you don't have to type it all by hand.
Given you can bypass doing it entirely with SQL, I would highly recommend using e.g. R or Python to process transactions in a ML useable way. The tidyr package with the gather function does exactly what you want to do.
Another way is to crosstabulate. It´s absolutely fine deriving a solution with the SQL standard, but a lot of problems can be much easier done within R or Python.
A table1 with just 3 columns
userid, itemid, sequence
would be more conducive for your purposes. You would be required to convert your AzureML output from the single line
Uid1, itm1,itm2,itm3,...,itm10
into 10 lines like
Uid1, itm1, 1
Uid1, itm2, 2
Uid1, itm3, 3
...
Uid1, itm10,10
Assuming you get the above output line as a (temporary) table output from AzureML with name tbla you could use the follwing UNION ALL construct (as suggested by Spencer Simpson):
INSERT INTO table1 (userid, itemid, sequence)
SELECT uid, itm1, 1 FROM tbla UNION ALL
SELECT uid, itm2, 2 FROM tbla UNION ALL
SELECT uid, itm3, 3 FROM tbla UNION ALL
SELECT uid, itm4, 4 FROM tbla UNION ALL
...
SELECT uid, itm10, 10 FROM tbla
To store the information into table1 which will be the only table you will have to deal with. No JOINs will be required anymore.
Note: I am not quite sure what your column name relates to. Is it the name of an item or the name of a user?
In both cases there should be a second table table2 that takes care of the correspondence between name and userid/itemid like
itm/usr name
This table will then be join-ed into any query that requires displaying the name column too.
What I did to work around this was to use Python (or R) and use the melt function.
There is also a pivot_table function in the dataframe.
So, you can have your columns be converted to rows. Then join those rows on the other table.
Reshaping and Pivot Tables
I have two tables - table1 and table2. Both contains two columns - rollnum,name. Now I wants to select all rows from table1 and randomly 5rows from table2. I have written like this
select rollnum,name from table1 union (select top 5 rollnum,name from table2 order by NEWID())
but it shows an error ORDER BY items must appear in the select list if the statement contains a UNION, INTERSECT or EXCEPT operator. please help . I think the mistake is at NEWID(). here rollnum is primary key
The problem is with the brackets. Try this instead
select rollnum,name from table1
union
select * from (select top 5 rollnum,name from table2 order by NEWID()) t
If you could have duplicate entries you may want to consider a union all instead of union
Try This..
SELECT rollnum AS 'NewID' ,
name
FROM table1
UNION
SELECT TOP 5
rollnum ,
name
FROM table2
ORDER BY NewID
NEWID() is a function which assign a value to a variable declared as the uniqueidentifier data type
I have 2 tables in an oracle database, which has the same column-names and types.
For example:
Table1: id, name, comment
Table2: id, name, comment
How can I show all data from both table in one view?
If you want 4 separate columns, simply use aliases, like you would any other select.
create or replace view vw_my_view as
select t1.id t1_id
,t1.comment t1_comment
,t2.id t2_id
,t2.comment t2_comment
from table1 t1
inner join table2 t2 on join condition
where filter conditions
EDIT Of course, your tables will relate to each other in some way, otherwise there is no way for a single row of your view to mean anything. You will therefore have a join condition to join the two tables, such as t1.id = t2.id
If you want them in two columns, use Union
create or replace view vw_my_view as
select id
,comment
from table1
union all -- use ALL unless you want to lose rows
select id
,comment
from table2;
Why two identical tables? Whatever happened to "Don't Repeat Yourself"? Sorry, sounds like a bad design smell to me.
Whatever difference inspired you to create two tables, I'll bet it really could be another attribute to distinguish two groups in one table.
SELECT * FROM TABLE1 UNION SELECT * FROM TABLE2
(or UNION ALL if you want duplicates)
I agree with what duffymo says, but if there is a good reason for it then a UNION will do it for you. e.g.
SELECT id, name, comment FROM Table1
UNION
SELECT id, name, comment FROM Table2
select * from table1
union
select * from table2;