How to write UPDATE SQL with Table alias in SQL Se

问题:

I have a very basic UPDATE SQL -

UPDATE HOLD_TABLE Q SET Q.TITLE = 'TEST' WHERE Q.ID = 101;

This query runs fine in Oracle, Derby, MySQL - but it fails in SQL server 2008 with following error:

"Msg 102, Level 15, State 1, Line 1 Incorrect syntax near 'Q'."

If I remove all occurrences of the alias, "Q" from SQL then it works.

But I need to use the alias.

回答1:

The syntax for using an alias in an update statement on SQL Server is as follows:

UPDATE Q
SET Q.TITLE = 'TEST'
FROM HOLD_TABLE Q
WHERE Q.ID = 101;

The alias should not be necessary here though.

回答2:

You can always take the CTE, (Common Tabular Expression), approach.

;WITH updateCTE AS
(
    SELECT ID, TITLE 
    FROM HOLD_TABLE
    WHERE ID = 101
)

UPDATE updateCTE
SET TITLE = 'TEST';