标签:do handle temp drop Server SQL table
Explicitly drop temp table or let SQL Server handle it
My view is, first see if you really need a temp table - or - can you make do with a Common Table Expression (CTE). Second, I would always drop my temp tables. Sometimes you need to have a temp table scoped to the connection (e.g. ##temp), so if you run the query a second time, and you have explicit code to create the temp table, you'll get an error that says the table already exists. Cleaning up after yourself is ALWAYS a good software practice.
EDIT: 03-Nov-2021
Another alternative is a TABLE variable, which will fall out of scope once the query completes:
DECLARE @MyTable AS TABLE (
MyID INT,
MyText NVARCHAR(256)
)
INSERT INTO
@MyTable
VALUES
(1, 'One'),
(2, 'Two'),
(3, 'Three')
SELECT
*
FROM
@MyTable
How do I drop table variables in SQL-Server? Should I even do this?
问题1:
Table variables are automatically local and automatically dropped -- you don't have to worry about it.
+1 - Also you can't drop them even if you wanted to - they persist as long as the session is open, just like any other variable. They are also unaffected by transactions. – JNK Apr 13 '11 at 18:04
问题2:
if somebody else comes across this... and you really need to drop it like while in a loop, you can just delete all from the table variable:
DELETE FROM @tableVariableName
标签:do,handle,temp,drop,Server,SQL,table 来源: https://www.cnblogs.com/chucklu/p/15620659.html
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