Confused over SQL statement for CASE WHEN inside INSERT
-
27-02-2021 - |
Domanda
I have the following SQL statement (that is intended for SQL Server):
INSERT INTO t1 (c1, c2)
VALUES (1, CASE WHEN (SELECT MAX(c2) FROM t1 AS maxV) IS NOT NULL THEN maxV+1 ELSE 1 END);
I get an error: "Invalid column name 'maxV'"
Why?
Soluzione
Try using COALESCE
:
INSERT INTO t1 (c1, c2)
SELECT 1, COALESCE(MAX(c2), 0) + 1
FROM t1
Altri suggerimenti
Try this...
INSERT INTO t1 (c1, c2)
VALUES (
1,
CASE
WHEN (SELECT MAX(c2) FROM t1) IS NOT NULL
THEN (SELECT MAX(c2)+1 FROM t1)
ELSE 1
END);
Another way of doing it...
INSERT INTO t1 (c1, c2)
VALUES (1, ISNULL(SELECT MAX(c2) FROM t1, 0)+1);
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