SQL CASE Expression -need query.

Question

Hi All , i have query like this
----------------SELECT *
FROM table A
WHERE 1=1 and CASE WHEN :T=1 THEN (EXISTS
(SELECT 'x'
FROM
(SELECT regexp_substr(str, '[^ ]+', 1, level) str
FROM
(SELECT 'SYS TAPE' str FROM dual
) t
CONNECT BY instr(str, ' ', 1, level - 1) > 0
) x
WHERE x.str not in('SYS','APPS')
AND A.STR LIKE '%'
|| x.str
|| '%'
)) ELSE A.STR END and a.sr=100;
Getting errorORA-00905: missing keyword..Please help

Answer 1

Well, I get other errors:
SQL> SELECT *
  2  FROM table A
  3  WHERE 1=1 and CASE WHEN :T=1 THEN (EXISTS
  4  (SELECT 'x'
  5  FROM
  6  (SELECT regexp_substr(str, '[^ ]+', 1, level) str
  7  FROM
  8  (SELECT 'SYS TAPE' str FROM dual
  9  ) t
10  CONNECT BY instr(str, ' ', 1, level - 1) > 0
11  ) x
12  WHERE x.str not in('SYS','APPS')
13  AND A.STR LIKE '%'
14  || x.str
15  || '%'
16  )) ELSE A.STR END and a.sr=100;
SP2-0552: Bind variable "T" not declared.
SQL> var T number
SQL> SELECT *
  2  FROM table A
  3  WHERE 1=1 and CASE WHEN :T=1 THEN (EXISTS
  4  (SELECT 'x'
  5  FROM
  6  (SELECT regexp_substr(str, '[^ ]+', 1, level) str
  7  FROM
  8  (SELECT 'SYS TAPE' str FROM dual
  9  ) t
10  CONNECT BY instr(str, ' ', 1, level - 1) > 0
11  ) x
12  WHERE x.str not in('SYS','APPS')
13  AND A.STR LIKE '%'
14  || x.str
15  || '%'
16  )) ELSE A.STR END and a.sr=100;
FROM table A
ERROR at line 2:
ORA-00906: missing left parenthesis
SQL> SELECT *
  2  FROM tableA
  3  WHERE 1=1 and CASE WHEN :T=1 THEN (EXISTS
  4  (SELECT 'x'
  5  FROM
  6  (SELECT regexp_substr(str, '[^ ]+', 1, level) str
  7  FROM
  8  (SELECT 'SYS TAPE' str FROM dual
  9  ) t
10  CONNECT BY instr(str, ' ', 1, level - 1) > 0
11  ) x
12  WHERE x.str not in('SYS','APPS')
13  AND A.STR LIKE '%'
14  || x.str
15  || '%'
16  )) ELSE A.STR END and a.sr=100;
WHERE 1=1 and CASE WHEN :T=1 THEN (EXISTS
ERROR at line 3:
ORA-00936: missing expressionFrom what I can make of it, looking at the concatenation of x.str in the query, you'll need dynamic SQL.
Posting a small, working testcase that illustrates your requirement would really help.