sql-执行这些方法之一的优点或缺点

我看到有些人确实这样加入

SELECT * FROM table1
JOIN table 2
ON table1_id = table2_id

在某些人这样做的地方

SELECT * 
FROM table1 
WHERE table1.table1_id = tabl2.table2_id;

有什么区别,什么更有效和有益

最佳答案

这就是为什么

SELECT * FROM table1
INNER JOIN table 2
ON table1_id = table2_id

SELECT * FROM table1
LEFT JOIN table 2
ON table1_id = table2_id

SELECT * FROM table1
RIGHT JOIN table 2
ON table1_id = table2_id

SELECT * FROM table1
FULL OUTER JOIN table 2
ON table1_id = table2_id