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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.
7 gru 2023 · 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: For example, if you want to map exam correct percentages to grade letters according to these rules:
15 lut 2018 · There are 3 main ways to perform a case-insensitive search in Oracle without using full-text indexes. Ultimately what method you choose is dependent on your individual circumstances; the main thing to remember is that to improve performance you must index correctly for case-insensitive searching.
For a simple CASE expression, the expr and all comparison_expr values must either have the same data type (CHAR, VARCHAR2, NCHAR, or NVARCHAR2, NUMBER, BINARY_FLOAT, or BINARY_DOUBLE) or must all have a numeric data type.
15 mar 2021 · WITH x AS ( SELECT level+1 a,level+2 b,level+3 c,level+4 d,level+5 e FROM dual CONNECT BY level <= 10) SELECT CASE a+b+c+d+e WHEN <30 THEN 'Below 30' WHEN <60 THEN 'Below 60' WHEN IS NULL THEN 'NULL' ELSE 'Above' END FROM x;
Oracle CASE statement. The SQL CASE statement is a logical statement that helps in putting values based on logical arguments. The CASE statement goes through conditions and returns a value when the first condition is met. So, once a condition is true, it will stop reading and return the result.
The CASE expression is like a more flexible version of the DECODE function. The value match CASE expression, or simple CASE expression, compares the value of the expression (DEPTNO), with the list of comparison expressions (10 - 40). Once it finds a match, the associated value is returned.
