in operator inside if condition and where clause in sql 服务器

Question

我必须根据 where 条件获取相同的架构但不同的数据。以下是我的查询。我正在尝试在 where 条件中应用 CASE 语句。主要问题是在这里处理 in 运算符。我不想在整个块上应用 IF 条件，因为我原来的 select 语句非常大。如果除了使用 CASE 语句

还有其他方法，我没问题

      --@input is an outside variable

      select col1, col2, col3, col4, col5
      from table
      where col6 in 
      case where @input = 'web' then (18, 19, 20, 22)
      case where @input = 'net' then (37, 69, 26, 25)
      case where @input = 'com' then (55, 66, 46, 27)
      else (55, 46, 46, 17)
      end

Answer 1

只需使用正则布尔表达式：

where (@input = 'web' and col6 in (18, 19, 20, 22)) or
      (@input = 'net' and col6 in (37, 69, 26, 25)) or
      (@input = 'com' and col6 in (55, 66, 46, 27)) or
      (@input not in ('web', 'net', 'com') and col6 in (55, 46, 46, 17))

in operator inside if condition and where clause in sql 服务器

in operator inside if condition and where clause in sql server

sql

sql-server

where-clause

in-operator