从多个表中选择字段并在一个表上使用OUTER JOIN

Question

我的查询从4个表中选择多个字段，我需要添加OUTER JOIN或LEFT OUTER JOIN来比较另一个表中的值。

SELECT *, table1.name, table2.wage, table3.shift, table4.vacation 
FROM table1, table2, table3, table4 OUTER JOIN table5 ON table1.name = table5.position 
WHERE table1.name = table2.name 
AND table2.wage = table3.wage 

这只是一个例子，但我如何使它工作，它似乎工作，如果我只有一个表在FROM子句。

Answer 1

使用ANSI语法您的所有连接，如

SELECT table1.name, table2.wage, table3.shift, table4.vacation, 
    table5.someDateTimeField 
FROM table1 
INNER JOIN table2 ON table1.name = table2.name 
INNER JOIN table3 ON table2.wage = table3.wage 
INNER JOIN table4 ON something = table4.something -- can't see this one in your example 
LEFT JOIN table5 ON table1.name = table5.position 
WHERE someArbitraryFilter BETWEEN 3 AND 7; 

此外，您SELECT条款看起来都错了。我不知道你后这*和你错过了逗号

Answer 2

尝试使用JOIN明确的，而不是那些隐含的：

SELECT table1.name, table2.wage, table3.shift, table4.vacation 
FROM table1 
JOIN table2 ON table1.name = table2.name 
JOIN table3 ON table2.wage = table3.wage 
JOIN table4 ON ?? 
LEFT JOIN table5 ON table1.name = table5.position 

加，看来你是缺少表4加盟条件。