我们如何使用带有 FROM 子句的 MySQL 子查询?
mysqlmysqli database
子查询可以在 SELECT 语句的 FROM 子句中很好地工作。以下是相同的语法 −
SELECT … FROM(subquery) [AS] name …
为了便于理解，我们使用了表 ‘cars’ 中的以下数据−
mysql> Select * from Cars; +------+--------------+---------+ | ID | Name | Price | +------+--------------+---------+ | 1 | Nexa | 750000 | | 2 | Maruti Swift | 450000 | | 3 | BMW | 4450000 | | 4 | VOLVO | 2250000 | | 5 | Alto | 250000 | | 6 | Skoda | 1250000 | | 7 | Toyota | 2400000 | | 8 | Ford | 1100000 | +------+--------------+---------+ 8 rows in set (0.02 sec)
现在在下面的查询中，我们使用带有 FROM 子句的子查询 −
mysql> Select Id_New, Name_New, Price_New FROM (SELECT Id as Id_New, Name as Name_New, Price as Price_New FROM Cars) as c Where Price_New > 500000; +--------+----------+-----------+ | Id_New | Name_New | Price_New | +--------+----------+-----------+ | 1 | Nexa | 750000 | | 3 | BMW | 4450000 | | 4 | VOLVO | 2250000 | | 6 | Skoda | 1250000 | | 7 | Toyota | 2400000 | | 8 | Ford | 1100000 | +--------+----------+-----------+ 6 rows in set (0.00 sec)
