按存储过程中的顺序可变

Question

我试图在存储过程中按子句顺序放置变量，但它返回一个错误。代码如下；

SELECT ...
FROM sys.dm_exec_query_stats AS qs
CROSS APPLY sys.dm_exec_sql_text(qs.SQL_HANDLE) AS st
CROSS APPLY sys.dm_exec_query_plan(qs.plan_handle) AS qp
WHERE @where LIKE '%'+@search+'%'
ORDER BY CASE @ORDER

错误是;

'Msg 1008, Level 16, State 1, Procedure sp_ExecInfo2, Line 40
The SELECT item identified by the ORDER BY number 1 contains a variable as part of the expression identifying a column position. Variables are only allowed when ordering by an expression referencing a column name.'

Answer 1

对于一小组候选订单；

ORDER BY 
  CASE @ORDER WHEN 1 THEN fld1 END,
  CASE @ORDER WHEN 2 THEN fld2 END,
  CASE @ORDER WHEN 3 THEN fld3 END