mysql - SQL - 根据多个条件插入数据

Question

我正在尝试根据另一个表中的数据插入具有不同数据的多行。

场景:

我有列 tbl1_action 和 tbl1_actiondate。 我想在 tbl2 中搜索 tbl2_reviewdate 和 tbl2_destroydate 中的数据。如果 tbl2_reviewdate 中有数据，那么我需要 tbl1_action = 'review' 和 tbl1_actiondate = tbl2_reviewdate。如果tbl2_destroydate中有数据，我需要另一行tbl1_action = 'destroy'和tbl1_actiondate = tbl2_destroydate。

总结一下所有可能的情况:

If tbl2_ReviewDate IS NULL AND
   tbl2_DestroyDate IS NULL

将一条记录插入到 tbl1 中，其中 action 且 actiondate = NULL

   tbl2_ReviewDate IS NOT NULL AND
   tbl2_DestroyDate IS NULL
Insert one row with tbl1_action = 'Review' and tbl1_actiondate = tbl2_reviewdate

   tbl2_ IS NULL AND
   tbl2_DestroyDate IS NOT NULL
Insert one row with tbl1_action = 'Destroy' and tbl1_actiondate = tbl2_destroydate

   tbl2_ReviewDate IS NOT NULL AND
   tbl2_DestroyDate IS NOT NULL
Insert two rows; One with tbl1_action = 'Destroy' and tbl1_actiondate = tbl2_destroydate and one with tbl1_action = 'Review' and tbl1_actiondate = tbl2_reviewdate.

是否可以在一个脚本中完成这一切？最好的方法是什么？

谢谢你的帮助

Answer 1

我想你想要这样的东西:

insert into table1(action, date)
    select 'Review', ActionDate
    from tbl2
    where tbl2.ReviewDate IS NOT NULL
    union all
    select 'Destroy', DestroyDate
    from tbl2
    where tbl2.DestroyDate IS NOT NULL;

您也可以将其作为两个单独的 insert 语句来执行。