从2表更新查询

Question

我有以下2个表：

table1是tracsName,tracsid,N,NE... table2是Tracs,kode,N2...。我想用这个代码用N2值改变N值，N和更多是风箭头

更新查询，可以更简单吗？ UPDATE table1 SET N=(select N2 from table2 where tracs='daraname2' AND kode='1-6'), NE=(select NE2 from table2 where tracs='daraname2' AND kode='1-6'), E=(select E2 from table2 where tracs='daraname2' AND kode='1-6'), SE=(select SE2 from table2 where tracs='daraname2' AND kode='1-6'), S=(select S2 from table2 where tracs='daraname2' AND kode='1-6'), SW=(select SW2 from table2 where tracs='daraname2' AND kode='1-6'), W=(select W2 from table2 where tracs='daraname2' AND kode='1-6'), NW=(select NW2 from table2 where tracs='daraname2' AND kode='1-6') WHERE tracsName='daraname2' AND tracsid='1-6'

我有错误，如果你能给我逻辑或代码，那就太棒了。

Answer 1

试试这段代码

UPDATE  table1

SET     table1.N = table2.n
FROM table2 WHERE name2 = name1 

Answer 2

以下是mysql的一般语法：

UPDATE TABLE1 a 
JOIN TABLE2 b ON a.name1 = b.name2
SET a.n1 = b.n2

以下是sql server的示例：

UPDATE a
SET n1 = b.n2    
FROM TABLE1 a 
JOIN TABLE2 b ON a.name1 = b.name2