使用php mysql从五个表中选择

Question

我有五张桌子：

1. table1
2. table2
3. table3
4. table4
5. 表5

在这些表中，字段很常见，即name。

SELECT *
FROM table1, table2, table3, table4, table5
WHERE table1.name = table2.name
    and table2.name = table3.name
    and table3.name = table4.name
    and table4.name = table5.name

此类查询是否有效？

Answer 1

试试这个例子并根据自己的喜好进行调整。

SELECT T1.*, T2.*, T3.*, T4.*, T5.*
FROM TABLE1 T1 
JOIN TABLE2 T2 ON T1.NAME = T2.NAME
JOIN TABLE2 T3 ON T1.NAME = T3.NAME
JOIN TABLE2 T4 ON T1.NAME = T4.NAME
JOIN TABLE2 T5 ON T1.NAME = T5.NAME