我想更新表,但不知道要更新哪一列。这是简单的例子
Update tablename set if col1='A' then col1='IA',col2='XXX' if col3='A' then col3='IA', col4='XXX' where (col1='A' and col2='UNKNOWN') or (col3='A' and col4='UNKNOWN')
这里col1或col3肯定包含'A'
col1
col3
'A'
请提供正确的查询给我
试试这个查询
UPDATE tablename SET col1=(CASE WHEN col1 LIKE 'A' THEN col1='IA' ELSE col1 END), col2=(CASE WHEN col1 LIKE 'A' THEN col2='XXX' ELSE col2 END), col3=(CASE WHEN col3 LIKE 'A' THEN col3='IA' ELSE col3 END), col3=(CASE WEHN col3 LIKE 'A' THEN col4='XXX' ELSE col4 END) WHERE (col1='A' AND col2='UNKNOWN') OR (col3='A' AND col4='UNKNOWN')