Hi i want to create a query which does the following. When the paramter 25 is selected it only runs part A of the query, if any other number is selected run both Table A and B select queries.
Example Below:
DECLARE #Type varchar (200)
select * from
(SELECT sort_code FROM dbo.Test 1
WHERE FUNDING_YEAR = 26)
union
(SELECT sort_code FROM dbo.Test 2
WHERE FUNDING_YEAR = 26)
Where case when #Type = 25 then select * from table2 else table 1
You just need to reference the variable in the WHERE clause
SELECT *
FROM TableA
WHERE #Type = 25
UNION
SELECT *
FROM TableB
The query above will always select everything in TableB and will only select everything in TableA when the variable is equal to 25.
Since you are using SSRS, what I would do is write the query to return all of the rows and then apply a filter in the SSRS report when the Paramater is 25. I wouldn't pass a paramater value to the SQL side unless it greatly reduces the run time of the query.
(I would have put this in a comment.)
Related
Have a scenario to select the value from table where range condition is present in source table.
Like,
TableA
ID value condition
1 20 A-M
2 50 N-Z
Select value from TableA where condition = 'C%'
--want to select TableA value from TableB by passing person name starts with like,
-- Here C is item name starts with
-- Should compare with range (A-M) and return first row.
-- Condition column is varchar(3)
I have seen the solution on other way where range can be compared with input value, but here the range is present in the source table. Please help.
If I have understood what you are after correctly you can use
SELECT TOP 1 B.*
FROM TableB B
WHERE B.Name LIKE (SELECT CONCAT('[',condition,']%') FROM TableA WHERE ID =1)
ORDER BY B.Id
If I understand correctly, you should be structuring TableA as:
ID value Lower Upper
1 20 A M
2 50 N Z
Then you want:
select a.*
from tableA a
where left(#name, 1) between a.lower and a.upper;
You can get this to work with your format, by doing:
select a.*
from tableA a
where left(#name, 1) between left(a.condition) and right(a.condition);
But I don't recommend that. Better to store the condition in two columns.
I would use QUOTENAME() function as
SELECT *
FROM TableA
WHERE #Condition LIKE QUOTENAME(Condition);
This will be as
WHERE 'C' LIKE [A-M] --return True
Demo1
Demo2
Always you should try to add data and DDL for setup correctly the test scenario, here my proposed solution:
DECLARE #SourceA AS TABLE
(
ID INT,
Value INT,
Condition VARCHAR(100)
);
INSERT INTO #SourceA ( ID ,
Value ,
Condition
)
VALUES ( 1 , -- ID - int
110 , -- Value - int
'A-M' -- Condition - varchar(100)
),(2,250,'N-Z')
DECLARE #Alphabet VARCHAR(200)='A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z';
; WITH MyCTE AS
(
SELECT ID,Value,Condition, SUBSTRING(#Alphabet, PATINDEX('%'+ LEFT(Condition,1) + '%' ,#Alphabet),(LEN(#Alphabet)-PATINDEX('%'+ RIGHT(Condition,1) + '%' ,#Alphabet))+1) AS FormattedCondition
FROM #SourceA
)
SELECT * FROM MyCTE
WHERE MyCTE.FormattedCondition LIKE '%C%'
I'm currently trying to do an SQL query that can detect if a SELECT query returns nothing, and then do another one if that is the case.
Here is what I mean:
IF SELECT * FROM table WHERE criteria = criteria RETURNS NO ROWS
THEN SELECT * FROM table WHERE criteria2 = criteria2
Is this possible? I don't think that an empty reply counts as "null" so I have a bit of a trouble with that.
You can do this in one statement, assuming the columns are the same:
SELECT *
FROM table
WHERE criteria = criteria
UNION ALL
SELECT *
FROM table
WHERE criteria2 = criteria2 AND
NOT EXISTS (SELECT 1 FROM table WHERE criteria = criteria);
You can use NOT EXISTS:
SELECT * FROM table WHERE criteria2 = criteria2
and not exists (
SELECT * FROM table WHERE criteria = criteria
)
union all
SELECT * FROM table WHERE criteria = criteria;
Here NOT EXISTS ensures that either part of the UNION ALL is returned. If the second criteria = criteria passes, then NOT EXISTS will return false and hence, only second part of the above query returns result. If it doesn't, it means, there are no rows with criteria = criteria and NOT EXISTS will return true and hence, only the first part return data.
I Did it like this
WITH
First AS (
SELECT t1.<field1>
FROM <schema1>.<table1> t1
WHERE
<criteria1>
[Other SQL Queries Options]
OFFSET 0
LIMIT 1
),
Second AS (
SELECT t2.<field2>
FROM <schema2>.<table2> t2
WHERE
<criteria2>
[Other SQL Queries Options]
OFFSET 0
LIMIT 1
)
SELECT <field1>
FROM First
UNION ALL
SELECT <field2> as <same name as field1>
FROM Second
WHERE NOT exists(
SELECT 1 FROM First
)
;
I am writing down a view in SQL server (DWH) and the use case pseudo code is:
-- Do some calculation and generate #Temp1
-- ... contains other selects
-- Select statement 1
SELECT * FROM Foo
JOIN #Temp1 tmp on tmp.ID = Foo.ID
WHERE Foo.Deleted = 1
-- Do some calculation and generate #Temp2
-- ... contains other selects
-- Select statement 2
SELECT * FROM Foo
JOIN #Temp2 tmp on tmp.ID = Foo.ID
WHERE Foo.Deleted = 1
The result of the view should be:
Select Statement 1
UNION
Select Statement 2
The intended behavior is the same as the yield returnin C#. Is there a way to tell the view which SELECT statements are actually part of the result and which are not? since the small calculations preceding what I need also contain selects.
Thank you!
Yield return in C# returns rows one at a time as they appear in some underlying function. This concept does not exist in SQL statements. SQl is set-based, returning the entire result set, conceptually as a unit. (That said, sometimes queries run slowly and you will see rows returned slowly or in batches.)
You can control the number of rows being returns using TOP (in SQL Server). You can select particular rows to be returned using WHERE statements. However, you cannot specify a UNION statement that conditionally returns rows from some components but not others.
The closest you may be able to come is something like:
if UseTable1Only = 'Y'
select *
from Table1
else if UseTable2Only = 'Y'
select *
from Table2
else
select *
from table1
union
select *
from table2
You can do something similar using dynamic SQL, by constructing the statement as a string and then executing it.
I found a better work around. It might be helpful for someone else. It is actually to include all the calculation inside WITH statements instead of doing them in the view core:
WITH Temp1 (ID)
AS
(
-- Do some calculation and generate #Temp1
-- ... contains other selects
)
, Temp2 (ID)
AS
(
-- Do some calculation and generate #Temp2
-- ... contains other selects
)
-- Select statement 1
SELECT * FROM Foo
JOIN Temp1 tmp on tmp.ID = Foo.ID
WHERE Foo.Deleted = 1
UNION
-- Select statement 2
SELECT * FROM Foo
JOIN Temp2 tmp on tmp.ID = Foo.ID
WHERE Foo.Deleted = 1
The result will be of course the UNION of all the outiside SELECT statements.
I have a sql query that I run against a sql server database eg.
SELECT * FROM MyTable WHERE Id = 2
This may return a number of records or may return none. If it returns none, I would like to alter my sql query to return a default record, is this possible and if so, how? If records are returned, the default record should not be returned. I cannot update the data so will need to alter the sql query for this.
Another way (you would get an empty initial rowset returned);
SELECT * FROM MyTable WHERE Id = 2
IF (##ROWCOUNT = 0)
SELECT ...
SELECT TOP 1 * FROM (
SELECT ID,1 as Flag FROM MyTable WHERE Id = 2
UNION ALL
SELECT 1,2
) qry
ORDER BY qry.Flag ASC
You can have a look to this post. It is similar to what you are asking
Return a value if no rows are found SQL
I hope that it can guide you to the correct path.
if not exists (SELECT top 1 * FROM mytable WHERE id = 2)
select * from mytable where id= 'whatever_the_default_id_is'
else
select * from mytable where id = 2
If you have to return whole rows of data (and not just a single column) and you have to create a single SQL query then do this:
Left join actual table to defaults single-row table
select
coalesce(a.col1, d.col1) as col1,
coalesce(a.col2, d.col2) as col2,
...
from (
-- your defaults record
select
default1 as col1,
default2 as col2,
...) as d
left join actual as a
on ((1 = 1) /* or any actual table "where" conditions */)
The query need to return the same number of fields, so you shouldn't do a SELECT * FROM but a SELECT value FROM if you want to return a default value.
With that in mind
SELECT value FROM MyTable WHERE Id = 2
UNION
SELECT CASE (SELECT count(*) FROM MyTable WHERE Id = 2)
WHEN 0 THEN 'defaultvalue'
END
I need a SP to return multiple sets of results. The second set of results would be based on a column of the first set of results.
So:
declare #myTable1 table(field0 int,field1 varchar(255))
insert into #myTable1 select top 1 field0, field1 from table1
declare #myTable2 table(field0 int,field3 varchar(255))
insert into #myTable2
select field0, field3 from table2
where #myTable1.field0 = #myTable2.field0
How do return #myTable1 and #myTable2 with my SP? Is this syntax even right at all?
My apologies, I'm still a newbie at SQL...
EDIT:
So, I'm getting an error on the last line of the code below that says: "Must declare the scalar variable "#myTable1""
declare #myTable1 table(field0 int,field1 dateTime)
insert into #myTable1
select top 1 field0, field1
from someTable1 m
where m.field4 > 6/29/2009
select * from #myTable1
select *
from someTable2 m2
where m2.field0 = #myTable1.field0
If I highlight and run the code up until the second select * it works fine...
when I highlight the rest it acts like the first variable doesn't exist...
EDIT2:
Figured that problem out. Thanks guys.
declare #myTable1 table(field0 int,field1 dateTime)
insert into #myTable1
select top 1 field0, field1
from someTable1 m
where m.field4 > 6/29/2009
select * from #myTable1
select *
from someTable2 m2
where m2.field0 = (select field0 from #myTable1)
You pretty much just select two result sets
SELECT * FROM #myTable1
SELECT * FROM #myTable2
However, some tools will hide some results (e.g. pgAdmin will only show the last) and some tools have some sort of requirement to get to the next result set (e.g. .NET's IDataReader's will not allow you to Read() from the second resultset until you call NextResult()).
Edit:
An alternative in this case, since the types of the two results match, is to combine them into a single resultset:
SELECT field0, field1 from #myTable1
UNION
SELECT field0, field3 from #myTable2
You can also choose between UNION ALL or UNION DISTINCT (the default) where the latter will only send rows that aren't repeats.
At the end of the Stored Proc, put:
SELECT * FROM #myTable1
SELECT * FROM #myTable2
This will return 2 result sets.