'' SQL Server 附近的语法不正确

Question

i'm a beginner with sqlserver, and i'm trying to compile a function on db, but a got some issues

Error messages

i'm guessing that is missing parentheses in importants components.

SELECT
  somefields
FROM
  table S,
  table2 SF
WHERE
      mycondition = myothercondition
  AND mycondition = myothercondition
  AND S.mycondition = myothercondition 
  AND SF.mycondition  = myothercondition 
  -- BELOW IS MY PROBLEM
  AND 
        (
          (NOT EXISTS
            (
                SELECT
                  1 
                FROM
                  table3 s 
                WHERE
                  mycondition = 'S'
            )
            AND
            (
                SELECT
                  CONVERT(DATETIME, CONVERT(VARCHAR, DATEADD(mm, myfield, myfield),103), 103) <= CONVERT(DATETIME, CONVERT(VARCHAR, myfield, 103), 103) -- INCORRECT SYNTAX NEAR '<'
                FROM
                  mytable A 
                WHERE
                  mycondition = '607'
            )
          ) 
            OR 
            (
                SELECT
                  1
            )
        ) -- Incorrect syntax near ')'
        AND CONVERT(DATETIME, CONVERT(VARCHAR, DATEADD(mm, MYFIELD, MYFIELD), 103), 103) <= CONVERT(DATETIME, CONVERT(VARCHAR, MYFIELD, 103), 103) 
        AND mycondition = 
        (
           SELECT
              MAX(MYFIELD) 
           FROM
              MYFIELD WITH(NOLOCK) 
           WHERE
              Mycondition = mycondition
              AND mycondition = mycondition
              AND mycondition = '086'
        )
        AND (NOT EXISTS -- Incorrect syntax near the keyword 'AND'
        (
           SELECT
              1 
           FROM
              table SF3 WITH(NOLOCK) 
           WHERE
              SF3.myfield= SF.myfield
              AND SF3.myfield= SF.myfield
              AND SF3.myfield IN
              (
                 '086',
                 '086'
              )
              AND SF3.myfield= 'S'
        )

I imagine that is happening some problems with the '(', but i really don't know, what's the problem. sorry but i need hide the field names and tables.

Answer 1

The first problem:

(SELECT CONVERT(DATETIME, CONVERT(VARCHAR, DATEADD(mm, myfield, myfield),103), 103) 
<= CONVERT(DATETIME, CONVERT(VARCHAR, myfield, 103), 103) 
                FROM
                  mytable A 
                WHERE
                  mycondition = '607')

If you remove the SELECT it removes the error line under the <= . Without further detail of the tables/columns, I can't go too deep into an answer. But you might try something similar to this (hypothetical example):

(CONVERT(DATETIME, CONVERT(VARCHAR, DATEADD(mm, mytable.myfield, othertable.myfield),103), 103) 
<= CONVERT(DATETIME, CONVERT(VARCHAR, mytable.myfield, 103), 103) 
                )
                and
                  mycondition = '607'

Answer 2

You cannot SELECT a boolean value:

SELECT
    CONVERT(DATETIME, CONVERT(VARCHAR, DATEADD(mm, myfield, myfield),103), 103)
    <= 
    CONVERT(DATETIME, CONVERT(VARCHAR, myfield, 103), 103) 
    -- INCORRECT SYNTAX NEAR '<'

replace this expression with a CASE evaluating to 1 or 0:

(SELECT CASE WHEN
    CONVERT(DATETIME, CONVERT(VARCHAR, DATEADD(mm, myfield, myfield),103), 103)
    <= 
    CONVERT(DATETIME, CONVERT(VARCHAR, myfield, 103), 103) 
    THEN 1 ELSE 0 END
    ...
) = 1