Alter View within stored procedure

问题:

How can we alter view within a stored procedure ?

create procedure createviewupdatepenaltypointsconsecutive
as
begin
alter VIEW consecutive
as


WITH cte as (
    SELECT *, 
           LAG([pointsRewarded], 1) OVER (PARTITION BY [EmployeeID] ORDER BY [WeekNumber]) as prev1_points,
           LAG([pointsRewarded], 2) OVER (PARTITION BY [EmployeeID] ORDER BY [WeekNumber]) as prev2_points,
           LAG([pointsRewarded], 3) OVER (PARTITION BY [EmployeeID] ORDER BY [WeekNumber]) as prev3_points
    FROM week1
)
SELECT *,
       CASE WHEN [pointsRewarded] = -10 AND prev1_points = -10  AND prev2_points = -10  AND prev3_points = -10 
            THEN -200
            WHEN [pointsRewarded] = -10 AND prev1_points = -10  AND prev2_points = -10 
            THEN -100
            WHEN [pointsRewarded] = -10 AND prev1_points = -10
            THEN -50
            ELSE 0
       END penalty       
FROM cte

end

M getting this error : Msg 156, Level 15, State 1, Procedure createviewupdatepenaltypointsconsecutive, Line 4 Incorrect syntax near the keyword 'VIEW'. Msg 319, Level 15, State 1, Procedure createviewupdatepenaltypointsconsecutive, Line 8 Incorrect syntax near the keyword 'with'. If this statement is a common table expression, an xmlnamespaces clause or a change tracking context clause, the previous statement must be terminated with a semicolon.

回答1:

You will not be able to run the ALTER VIEW statement like that in your stored procedure. So to solve your problem you must take 2 actions:

1) To correct the error that currently appears you have to begin the CTE with a semicolon like that:

WITH cte as (
    SELECT *, 
       LAG([pointsRewarded], 1) OVER (PARTITION BY [EmployeeID] ORDER BY [WeekNumber]) as prev1_points,
       LAG([pointsRewarded], 2) OVER (PARTITION BY [EmployeeID] ORDER BY [WeekNumber]) as prev2_points,
       LAG([pointsRewarded], 3) OVER (PARTITION BY [EmployeeID] ORDER BY [WeekNumber]) as prev3_points
FROM week1)
SELECT *,
   CASE WHEN [pointsRewarded] = -10 AND prev1_points = -10  AND prev2_points = -10  AND prev3_points = -10 
        THEN -200
        WHEN [pointsRewarded] = -10 AND prev1_points = -10  AND prev2_points = -10 
        THEN -100
        WHEN [pointsRewarded] = -10 AND prev1_points = -10
        THEN -50
        ELSE 0
   END penalty       
FROM cte

(Or even better begin terminating all your SQL Statements with semicolon as the alternative is deprecated).

2) Convert your alter view statement in a dynamic SQL string and execute it using sp_executesql as the ALTER VIEW statement must be the first one in the batch:

CREATE PROCEDURE createviewupdatepenaltypointsconsecutive
AS
BEGIN
   DECLARE @STMT AS NVARCHAR(MAX) =
   '
  ALTER VIEW consecutive
  AS


  WITH cte as (
      SELECT *, 
             LAG([pointsRewarded], 1) OVER (PARTITION BY [EmployeeID] ORDER BY [WeekNumber]) as prev1_points,
             LAG([pointsRewarded], 2) OVER (PARTITION BY [EmployeeID] ORDER BY [WeekNumber]) as prev2_points,
             LAG([pointsRewarded], 3) OVER (PARTITION BY [EmployeeID] ORDER BY [WeekNumber]) as prev3_points
      FROM week1
  )
  SELECT *,
         CASE WHEN [pointsRewarded] = -10 AND prev1_points = -10  AND prev2_points = -10  AND prev3_points = -10 
              THEN -200
              WHEN [pointsRewarded] = -10 AND prev1_points = -10  AND prev2_points = -10 
              THEN -100
              WHEN [pointsRewarded] = -10 AND prev1_points = -10
              THEN -50
              ELSE 0
         END penalty       
  FROM cte
   '
   EXEC sp_executesql @STMT;
END