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
我以前使用过INSERT SELECT。对于那些想使用新东西的人来说，这里有一个类似的解决方案，但它要短得多：
UPDATE table1 // Table that's going to be updated.
LEFT JOIN // Type of join.
table2 AS tb2 // Second table and rename for easy.
ON
tb2.filedToMatchTables = table1.fieldToMatchTables // Fields to connect both tables.
SET
fieldFromTable1 = tb2.fieldFromTable2; // Field to be updated on table1.
field1FromTable1 = tb2.field1FromTable2, // This is in the case you need to
field1FromTable1 = tb2.field1FromTable2, // update more than one field.
field1FromTable1 = tb2.field1FromTable2; // Remember to put ; at the end.
其他回答
您可以使用以下内容在SQL Server中进行更新：
UPDATE
T1
SET
T1.col1 = T2.col1,
T1.col2 = T2.col2
FROM
Table1 AS T1
INNER JOIN Table2 AS T2
ON T1.id = T2.id
WHERE
T1.col3 = 'cool'
如果使用MySQL而不是SQL Server，语法为：
UPDATE Table1
INNER JOIN Table2
ON Table1.id = Table2.id
SET Table1.col1 = Table2.col1,
Table1.col2 = Table2.col2
UPDATE
Table_A
SET
Table_A.col1 = Table_B.col1,
Table_A.col2 = Table_B.col2
FROM
Some_Table AS Table_A
INNER JOIN Other_Table AS Table_B
ON Table_A.id = Table_B.id
WHERE
Table_A.col3 = 'cool'
如果你想加入表本身（这不会经常发生）：
update t1 -- just reference table alias here
set t1.somevalue = t2.somevalue
from table1 t1 -- these rows will be the targets
inner join table1 t2 -- these rows will be used as source
on .................. -- the join clause is whatever suits you
选项1：使用内部联接：
UPDATE
A
SET
A.col1 = B.col1,
A.col2 = B.col2
FROM
Some_Table AS A
INNER JOIN Other_Table AS B
ON A.id = B.id
WHERE
A.col3 = 'cool'
选项2：共同相关子查询
UPDATE table
SET Col1 = B.Col1,
Col2 = B.Col2
FROM (
SELECT ID, Col1, Col2
FROM other_table) B
WHERE
B.ID = table.ID
