我需要更新表名(col1name)
I need to UPDATE tablename (col1name)
如果已经有数据,我需要附加值'a,b,c'如果它是 NULL,我需要添加值 'a,b,c'
If there is already data, I need to append it with values 'a,b,c' If it is NULL, I need to add the values 'a,b,c'
我知道有一个 CONCAT 参数,但不确定 SQL 语法是什么.
I know there is a CONCAT argument, but not sure what the SQL syntax would be.
update tablename set col1name = concat(ifnull(col1name, 'a,b,c'), 'a,b,c')
以上正确吗?
试试这个查询:
update tablename set col1name = concat(ifnull(col1name,""), 'a,b,c');
参考这个 sql fiddle 演示.
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