MySQL别名帮助ERROR 1054（42S22）

Question

我将保持简洁和简单。我想执行此查询：

mysql> SELECT ORDER_NUM, NUM_ORDERED * QUOTED_PRICE AS TOTAL_AMOUNT
    -> FROM ORDER_LINE
    -> WHERE TOTAL_AMOUNT > '1000'
    -> ORDER BY ORDER_NUM;
ERROR 1054 (42S22): Unknown column 'TOTAL_AMOUNT' in 'where clause'

我确定这很简单，但我不明白为什么这不会使用别名TOTAL_AMOUNT。任何帮助表示赞赏！

Answer 1

试试这个

mysql> SELECT ORDER_NUM, NUM_ORDERED * QUOTED_PRICE AS TOTAL_AMOUNT
-> FROM ORDER_LINE
-> WHERE NUM_ORDERED * QUOTED_PRICE > '1000'
-> ORDER BY ORDER_NUM;

Answer 2

检查星号是否没有导致您出现问题，或者如果您没有逗号，如果这不起作用，请将别名包含在严重重音符号之间，如下所示：

... QUOTED_PRICE AS `TOTAL_AMOUNT`...