Internal condition AND in SELECT

Question

I have table with data
order item
A 123
A 124
B 123
C 125
C 123
C 124
D 123
I need select all data except cause when order in ('A','D') and item=123 but I need another items from order A
I try
select order, item from tableorder where (mo in ('A','D') and item <> '123')
it get me
A 124
but I need
A 124
B 123
C 125
C 123
C 124
Thank you for help

Answer 1

Welcome to the forum.
SQL> WITH sample_data AS (SELECT 'A' ordr,123 item FROM dual UNION ALL
  2                       SELECT 'A' ordr,124 item FROM dual UNION ALL
  3                       SELECT 'B' ordr,123 item FROM dual UNION ALL
  4                       SELECT 'B' ordr,123 item FROM dual UNION ALL
  5                       SELECT 'C' ordr,125 item FROM dual UNION ALL
  6                       SELECT 'C' ordr,123 item FROM dual UNION ALL
  7                       SELECT 'C' ordr,124 item FROM dual UNION ALL
  8                       SELECT 'D' ordr,123 item FROM dual
  9                       )
10  --End of sample data creation with subquery Factoring.
11  --You can use the query from here with your original table name. 
12  SELECT * FROM sample_data
13  WHERE 1= CASE WHEN (ordr='A' OR ordr='D') AND item=123
14           THEN 0
15           ELSE 1
16           END;
O       ITEM
A        124
B        123
B        123
C        125
C        123
C        124
6 rows selected.
SQL>