MySQL UPDATE 将数据附加到列中

2021-11-16 00:00:00 sql-update append mysql

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?

推荐答案

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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