mysql - 如果 MySQL 中的字段为空，如何更新字段？

Question

我有一个名为size. 有些行是null. 我想将这些行的size字段更新为0. 我会怎么做？

score 3 · Accepted Answer

3

update tablename
set    size = 0
where  size is null;

于 2012-09-13T12:40:03.240 回答

score 3 · Accepted Answer

3

UPDATE TABLENAME
SET size = 0
WHERE size IS NULL

于 2012-09-13T12:40:47.323 回答

score 2 · Accepted Answer

您必须WHERE size IS NULL在更新子句中使用：

UPDATE table SET size = 0 WHERE size IS NULL;

score 0 · Accepted Answer

0

UPDATE TABLENAME 
SET SIZE=0
WHERE SIZE IS NULL;

于 2012-09-13T12:41:56.080 回答

4 回答 4