Question

我很好奇是否有人可以帮助我。

这是表格和字段： enter image description here

这是我得到的例子：

这就是我到目前为止

Select ipno,
SUM(IF(retcode<100,0)) As '<100',
SUM(IF(retcode>=100   and retcode<200,0)) As '100s',
SUM(IF(retcode>=200  and retcode<300,0)) As '200s',
SUM(IF(retcode>=300 and retcode<400,0)) As '300s',
SUM(IF(retcode>=400,0)) As '400s'
From WebLog
Group By ipno;

但我一直收到此错误

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ')) As '<100',
SUM(IF(retcode>=100   and retcode<200,0)) As '100s',
SUM(IF(retcod' at line 2

Answer 1

你不需要MySQL中的if()：

Select ipno,
       SUM(retcode < 100) As `<100`,
       SUM(retcode >= 100 and retcode < 200) As `100s`,
       SUM(retcode >= 200 and retcode < 300) As `200s`,
       SUM(retcode >= 300 and retcode < 400) As `300s`,
       SUM(retcode >= 400) As `400s`
From WebLog
Group By ipno;

MySQL将布尔表达式视为数字上下文中的数字，使用＆＃34; 1＆＃34;对于真实的d＆＃34; 0＆＃34;为假。

此外，不要使用单引号作为列别名。仅对日期和字符串常量使用单引号。

Answer 2

这对我也有用。谢谢大家。

#1e1d22

带有IF语句的交叉表查询

2 个答案: