CASE WHEN IFNULL( t_temp.id, 0 ) = 0 THEN "" ELSE "selected" END AS "selected"用中文解释
时间: 2023-11-01 07:08:09 浏览: 22
这段代码的意思是:如果t_temp.id为空,则返回空字符串,否则返回"selected"。其中,IFNULL函数用于判断t_temp.id是否为空,如果为空则返回0,否则返回t_temp.id的值。而CASE WHEN语句用于根据条件返回不同的值。最终结果为一个名为"selected"的字段,该字段的值为""或"selected"。
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CASE WHEN IFNULL( t_temp.id, 0 ) = 0 THEN "" ELSE "selected" END AS "selected"
This SQL statement is using the CASE WHEN function to check if the value of IFNULL( t_temp.id, 0 ) equals 0. If it does, then an empty string is returned. If it does not, then the string "selected" is returned. The result of this statement is an additional column in the output of a SQL query that indicates whether a certain value is selected or not.
Select(`ifnull(sum(CASE WHEN b.asid=a.link_id and a.user_type=? then b.sum_order_amt else 0 end),0) as sum_pay_amt, ifnull(sum(CASE WHEN b.asid=a.link_id and a.user_type=? then 1 else 0 end),0) as order_sum, ifnull(sum(CASE WHEN a.stmt_status=1 THEN a.profit ELSE 0 END), 0.00) as sum_profit, ifnull(sum(CASE WHEN a.stmt_status=0 and b.asid=a.link_id and a.user_type=? THEN a.pay_amt+b.sum_order_amt ELSE 0 END), 0.00) as ret_pay_amt`, model.USER_TYPE_SUPPLIER_AGENT, model.USER_TYPE_SUPPLIER_AGENT, model.USER_TYPE_SUPPLIER_AGENT).
这段代码是一个SQL查询语句,使用了`SELECT`关键字来选择多个字段。具体的查询内容如下:
- `ifnull(sum(CASE WHEN b.asid=a.link_id and a.user_type=? then b.sum_order_amt else 0 end),0) as sum_pay_amt`:计算满足条件的`b.sum_order_amt`的总和,如果没有满足条件的记录,则返回0。
- `ifnull(sum(CASE WHEN b.asid=a.link_id and a.user_type=? then 1 else 0 end),0) as order_sum`:计算满足条件的记录数,如果没有满足条件的记录,则返回0。
- `ifnull(sum(CASE WHEN a.stmt_status=1 THEN a.profit ELSE 0 END), 0.00) as sum_profit`:计算`a.profit`字段的总和,但仅针对`a.stmt_status`等于1的记录进行计算,如果没有满足条件的记录,则返回0.00。
- `ifnull(sum(CASE WHEN a.stmt_status=0 and b.asid=a.link_id and a.user_type=? THEN a.pay_amt+b.sum_order_amt ELSE 0 END), 0.00) as ret_pay_amt`:计算满足条件的`a.pay_amt+b.sum_order_amt`字段的总和,但仅针对`a.stmt_status`等于0、`b.asid=a.link_id`和`a.user_type=?`的记录进行计算,如果没有满足条件的记录,则返回0.00。
这些查询字段将作为结果的列,并分别命名为`sum_pay_amt`、`order_sum`、`sum_profit`和`ret_pay_amt`。其中,`?`是一个占位符,用于将`model.USER_TYPE_SUPPLIER_AGENT`的值填充到查询中。