Question

SELECT t1.status, t3.guid, t3.objectID
FROM Table1 t1, Table2 t2, Table3 t3
WHERE t2.ID = t3.ID
   AND t1.ID = t2.ID
   AND t3.Guid IN ('', '', '')

如何将此转换为我设置t1.status = 1？

的更新语句

Answer 1

我首先将其转换为使用连接而不是“经典连接”：

select t1.status, t3.guid, t3.objectID
from Table1 t1
inner join Table2 t2 on t2.ID = t1.ID
inner join Table3 t3 on t3.ID = t2.ID
where t3.Guid in ('', '', '')

然后你可以直接翻录select语句并对其进行更新和设置语句：

update t1
set status = 1
from Table1 t1
inner join Table2 t2 on t2.ID = t1.ID
inner join Table3 t3 on t3.ID = t2.ID
where t3.Guid in ('', '', '')

Answer 2

尝试这样的事情：

update Table1
set status = 1
from Table1 t1
    inner join Table2 t2 on t1.ID = t2.ID
    inner join Table3 t3 on t2.ID = t3.ID
where t3.Guid IN ('', '', '');

Answer 3

UPDATE Table1
SET status = 1
FROM Table1 t1, Table2 t2, Table3 t3
WHERE t2.ID = t3.ID
   AND t1.ID = t2.ID
   AND t3.Guid IN ('', '', '')

Answer 4

update Table1
set status = 1
FROM Table1 t1, Table2 t2, Table3 t3
WHERE t2.ID = t3.ID
   AND t1.ID = t2.ID
   AND t3.Guid IN ('', '', '')

Answer 5

UPDATE Table1 set status = 1 
from table2 t2, table 3 t3 
where t2.ID = t3.ID 
and Table1.ID = t2.ID 
and t3.GUID in ('','','')

Answer 6

我相信MS SQL Server（但不是Oracle），你可以写：

UPDATE TABLE1 
set t1.status = 1
FROM Table1 t1, Table2 t2, Table3 t3
WHERE t2.ID = t3.ID
   AND t1.ID = t2.ID
   AND t3.Guid IN ('', '', '')

Answer 7

MERGE
INTO Table1 t1
USING
  (
  SELECT t2.id
  FROM Table2 t2, Table3 t3
  WHERE 
    t3.ID = t2.id
    AND t3.GUID IN ('', '', '')
 ) to
ON t1.id = to.id
WHEN MATCHED THEN
  UPDATE
  SET t1.status = 1

Answer 8

update t1 set t1.status=(select 1 from Table1 t1, Table2 t2, Table3 t3 WHERE t2.ID = t3.ID   AND t1.ID = t2.ID  AND t3.Guid IN ('', '', ''))

将SELECT转换为更新语句

8 个答案: