如何从另一个表更新一个表？

Question

我想将行从一个表更新到另一个表，两者都具有相同的结构，我使用此查询

UPDATE bh_master_ritesh_stock AS st
SET st.tag_uid = apprv.tag_uid ,st.stk_id = apprv.stk_id
FROM bh_stock_approval AS apprv
WHERE st.stock_id = apprv.stock_id

但它给了我这个错误，

You have an error in your SQL syntax; check the manual that corresponds to 
your MySQL server version for the right syntax to use near 
'FROM bh_stock_approval as apprv WHERE st.stock_id = apprv.stock_id' at line 3

我的错在哪里？ 或者我使用错误的查询？

Answer 1

试试这段代码：

UPDATE bh_master_ritesh_stock AS st,bh_stock_approval AS apprv
SET st.tag_uid = apprv.tag_uid ,st.stk_id = apprv.stk_id 
WHERE st.stock_id = apprv.stock_id

因为UPDATE不能使用From子句

Answer 2

您的语法完全错误，“FROM”是意外的：

UPDATE bh_master_ritesh_stock AS st,bh_stock_approval AS apprv
SET st.tag_uid = apprv.tag_uid ,st.stk_id = apprv.stk_id 
WHERE st.stock_id = apprv.stock_id

对于涉及更多表的其他示例，请查看此处 。

Answer 3

尝试这个。

UPDATE bh_master_ritesh_stock st
INNER JOIN bh_stock_approval apprv on
  st.stock_id = apprv.stock_id
SET 
  st.tag_uid = apprv.tag_uid ,st.stk_id = apprv.stk_id

Answer 4

UPDATE bh_master_ritesh_stock A
SET A.tag_uid, A.stk_id =( select B.tag_uid, B.stk_id
FROM bh_stock_approval B WHERE A.stock_id = B.stock_id)
WHERE EXISTS(SELECT '1' FROM bh_stock_approval B1 WHERE A.stock_id =B1.stock_id)