I have following code
DECLARE @a INT
SET @a = 1
SELECT TOP 1
@a = id
FROM
test
WHERE
name = 'notexist'
SELECT @a
variable @a
will still have 1
value if the SELECT
statement doesn't find any row, is it possible to set the @a
variable to null if the SELECT
statement doesn't find any row without adding SET @a = NULL
before SELECT
statement?
Assign value this way
SET @a = (
SELECT TOP 1
id
FROM
test
WHERE
name = 'notexist'
)
SELECT @a