Question

逻辑

逻辑是如果订单被取消然后返回0，否则返回欠款值 - 付款值

小查询

CASE WHEN d.cancelled = 'TRUE' 
     THEN '0' 
     ELSE (to_char(b.owed)) - (to_char(d.paid)) 
     END AS balance,

获取错误

ORA-00932：不一致的数据类型：预期CHAR得到NUMBER   00932. 00000 - “不一致的数据类型：预期％s获得％s”   *原因：
  *行动：   行错误：25列：58

Answer 1

试试这个，你的情况应该返回数字或varchar，现在你的情况返回＆＃39; 0＆＃39;作为varchar，否则作为数字。两者都应该返回一个varchar，或者两者都应该返回一个数字。

当两者都返回varchar

时

CASE WHEN d.cancelled = 'TRUE' 
     THEN '0' 
     ELSE to_char((to_char(b.owed)) - (to_char(d.paid)))
     END AS balance,

OR

当两者都返回

时

CASE WHEN d.cancelled = 'TRUE' 
         THEN 0 
         ELSE (to_char(b.owed)) - (to_char(d.paid))
         END AS balance,

OR

当两者都返回

时

CASE WHEN d.cancelled = 'TRUE' 
         THEN 0 
         ELSE (b.owed - d.paid)
         END AS balance,

Answer 2

此(to_char(b.owed)) - (to_char(d.paid))将是一个数字，0是一个字符串。您应该删除then子句中的刻度线或者删除else子句中的to_char：to_char((to_char(b.owed)) - (to_char(d.paid)))或简单地(b.owed - d.paid)

ORA-00932：不一致的数据类型：预期CHAR得到NUMBER

2 个答案: