RPAD and CASE statment - Oracle SQL - Missing Right Parenthesis Error

Question

Trying to incorporate a CASE statement in the select statement. One works, but this one returns the error "missing right parenthesis."

|| CASE WHEN RPAD (RA.TAX_ID,9) IS NOT NULL THEN (RA.TAX_ID,9) ELSE '999999999',9) END

Here's an edited version of the query to give context. The second case statement works.

    >SELECT DISTINCT
    > RPAD ('D', 1)
    > || CASE WHEN RPAD (RA.TAX_ID,9) IS NOT NULL THEN (RA.TAX_ID,9) ELSE  '999999999',9) END

    > || CASE WHEN RPAD (RA.ACCOUNT_ENTITY_IND, 1) = 'P' THEN 'I' ELSE ' ' END
    > || RPAD (RA.LAST_NAME, 20)
    > || RPAD (RA.FIRST_NAME, 20)
    > || RPAD (' ', 10)
    > AS HEADER_ROW

Answer 1

Both the then and else elements are malformed.

 || CASE WHEN RPAD (RA.TAX_ID,9) IS NOT NULL THEN (RA.TAX_ID,9) ELSE  '999999999',9) END
                                                  ^         ^^^                  ^^^

Presumably the then is supposed to be another rpad() call, but the else looks like it should be a simple literal:

 || CASE WHEN RPAD (RA.TAX_ID,9) IS NOT NULL THEN RPAD (RA.TAX_ID,9) ELSE  '999999999' END

If you use an IDE like SQL Developer it will highlight simple syntax mistakes like this for you.

Answer 2

用coalesce()会不会更简单？

|| COALESCE(RPAD(RA.TAX_ID,9), '999999999') ||

Answer 3

您是否在这里没有看到未封闭的括号：==>'999999999'，9）