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29 Δεκ 2014 · TO_DATE with proper format model should do the trick. Let's stick to a format model first. SQL> alter session set nls_date_format='dd/mm/yyyy hh24:mi:ss'; Session altered. Now, let's use TO_DATE to explicitly convert the string literal to date.
For example, you can use the CASE expression in statements such as SELECT, UPDATE, or DELETE, and in clauses like SELECT, WHERE, HAVING, and ORDDER BY. Oracle CASE expression has two formats: the simple CASE expression and the searched CASE expression. Both formats support an optional ELSE clause.
26 Ιαν 2018 · In PL/SQL, there are two flavors. First, the CASE statement evaluates the contents of a variable and returns a value (implemented as a function). I refer to this version of the CASE statement as Format 1; Oracle calls it a Simple CASE statement.
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.
7 Δεκ 2023 · 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: For example, if you want to map exam correct percentages to grade letters according to these rules:
One of the conditions in CASE statements in PL/SQL must be true. If the database reaches the end of the statement without activating one, it raises CASE_NOT_FOUND.
19 Απρ 2019 · I have a case statement that is causing trouble for the formatter and code outline. select case when "a" < "b" then "b" else "a" end from dual; --Here, "a" is a static value and "b" is a case statement. for example, select case when 2 < case when 1=1 then 1 else 0 end. then case when 1=1 then 1 else 0 end. else 2. end. from dual;
