在SQL Server中,可以使用insert将行插入到表中。。SELECT语句:

INSERT INTO Table (col1, col2, col3)
SELECT col1, col2, col3 
FROM other_table 
WHERE sql = 'cool'

是否也可以使用SELECT更新表?我有一个包含这些值的临时表,并希望使用这些值更新另一个表。也许是这样的:

UPDATE Table SET col1, col2
SELECT col1, col2 
FROM other_table 
WHERE sql = 'cool'
WHERE Table.id = other_table.id

当前回答

在接受的答案中,在以下内容之后:

SET
Table_A.col1 = Table_B.col1,
Table_A.col2 = Table_B.col2

我想补充一句:

OUTPUT deleted.*, inserted.*

我通常做的是将所有内容放入回滚事务中,并使用“OUTPUT”:这样我就可以看到即将发生的一切。当我对所看到的感到满意时,我将ROLLBACK更改为COMMIT。

我通常需要记录我所做的事情,所以我在运行回滚查询时使用“results to Text”选项,并保存脚本和OUTPUT的结果。(当然,如果我更改了太多行,这是不可行的)

其他回答

Use:

drop table uno
drop table dos

create table uno
(
    uid int,
    col1 char(1),
    col2 char(2)
)
create table dos
(
    did int,
    col1 char(1),
    col2 char(2),
    [sql] char(4)
)
insert into uno(uid) values (1)
insert into uno(uid) values (2)
insert into dos values (1,'a','b',null)
insert into dos values (2,'c','d','cool')

select * from uno 
select * from dos

或者:

update uno set col1 = (select col1 from dos where uid = did and [sql]='cool'), 
col2 = (select col2 from dos where uid = did and [sql]='cool')

OR:

update uno set col1=d.col1,col2=d.col2 from uno 
inner join dos d on uid=did where [sql]='cool'

select * from uno 
select * from dos

如果两个表中的ID列名相同,则只需将表名放在要更新的表之前,并为所选表使用别名,即:

update uno set col1 = (select col1 from dos d where uno.[id] = d.[id] and [sql]='cool'),
col2  = (select col2 from dos d where uno.[id] = d.[id] and [sql]='cool')
UPDATE YourTable 
SET Col1 = OtherTable.Col1, 
    Col2 = OtherTable.Col2 
FROM (
    SELECT ID, Col1, Col2 
    FROM other_table) AS OtherTable
WHERE 
    OtherTable.ID = YourTable.ID
UPDATE TQ
SET TQ.IsProcessed = 1, TQ.TextName = 'bla bla bla'
FROM TableQueue TQ
INNER JOIN TableComment TC ON TC.ID = TQ.TCID
WHERE TQ.IsProcessed = 0

要确保正在更新所需内容,请先选择

SELECT TQ.IsProcessed, 1 AS NewValue1, TQ.TextName, 'bla bla bla' AS NewValue2
FROM TableQueue TQ
INNER JOIN TableComment TC ON TC.ID = TQ.TCID
WHERE TQ.IsProcessed = 0

以下示例使用派生表(FROM子句后的SELECT语句)返回旧值和新值以供进一步更新:

UPDATE x
SET    x.col1 = x.newCol1,
       x.col2 = x.newCol2
FROM   (SELECT t.col1,
               t2.col1 AS newCol1,
               t.col2,
               t2.col2 AS newCol2
        FROM   [table] t
               JOIN other_table t2
                 ON t.ID = t2.ID) x

我会修改罗宾的优秀答案如下:

UPDATE Table
SET Table.col1 = other_table.col1,
 Table.col2 = other_table.col2
FROM
    Table
INNER JOIN other_table ON Table.id = other_table.id
WHERE
    Table.col1 != other_table.col1
OR Table.col2 != other_table.col2
OR (
    other_table.col1 IS NOT NULL
    AND Table.col1 IS NULL
)
OR (
    other_table.col2 IS NOT NULL
    AND Table.col2 IS NULL
)

如果没有WHERE子句,您甚至会影响不需要受影响的行,这可能(可能)导致索引重新计算或触发真正不应该触发的触发器。