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14 mar 2013 · Here is the query: SELECT t.first_name, t.last_name, t.employid, t.status. FROM employeetable t. WHERE IF status_flag = STATUS_ACTIVE then t.status = 'A'. IF status_flag = STATUS_INACTIVE then t.status = 'T'. IF source_flag = SOURCE_FUNCTION then t.business_unit = 'production'.
30 wrz 2016 · I'm interesting that how can I use if-then-else statement or any control structure in where clause in Oracle. I want to use as: when pcustomer_id IS NULL then WHERE c.customer_id IS NULL; and when pcustomer_id IS NOT NULL then c.customer_id = pcustomer_id. How can I do it?
7 gru 2023 · IF-THEN logic in SELECT and WHERE with CASE expressions in Oracle SQL. December 7, 2023 | 8 minute read. Chris Saxon. Developer Advocate. There’s no if keyword in SQL. If you want to do if-else-then logic in select, where or anywhere else in a statement, you need a case expression. This is a series of when clauses that the database runs in order:
WHERE. IF ((obj_D= '0' OR obj_D IS NULL) AND (obj_C= '0' OR obj_C IS NULL)) THEN. WHERE w.customer_id =obj_A. AND w.delegate_user_id = obj_B; ELSE IF ((obj_D= '0 'OR obj_D IS NULL) AND (obj_C<> '0' OR obj_C IS NOT NULL)) THEN. WHERE w.customer_id = obj_A. AND w.category_id = obj_C.
In a simple CASE expression, Oracle Database searches for the first WHEN ... THEN pair for which expr is equal to comparison_expr and returns return_expr. If none of the WHEN ... THEN pairs meet this condition, and an ELSE clause exists, then Oracle returns else_expr. Otherwise, Oracle returns null.
The IF statement allows you to either execute or skip a sequence of statements, depending on a condition. The IF statement has three forms: IF THEN ELSE. IF THEN ELSIF. PL/SQL IF THEN statement. The following illustrates the structure of the IF THEN statement: IF condition THEN . statements; END IF;
Oracle CASE expression allows you to add if-else logic to SQL statements without having to call a procedure. The CASE expression evaluates a list of conditions and returns one of the multiple possible results. You can use a CASE expression in any statement or clause that accepts a valid expression.
