从 2 Table 更新查询

Question

我有以下 2 个表格：

表 1 是 tracsName,tracsid,N,NE... 表 2 是 Tracs,kode,N2...。我想用这段代码用N2值改变N值，N多的是风箭头

更新查询，能不能简单点？ 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'

我有一个错误，如果你能给我逻辑或代码，那就太好了。

Answer 1

试试这个代码

UPDATE  table1

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

Answer 2

这是 mysql 的一般语法：

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

这里是 sql server 的例子：

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

从 2 Table 更新查询

Update Query From 2 Table

sql

nested