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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.
It’s a single-page PDF file that lists all of the Oracle SQL functions and their parameters. Save it, or print it out and put it on your desk. You’ll never have to worry about the parameters of each function again! Download the file here: Oracle SQL Function Cheat Sheet.
SQL statements are the means by which programs and users access data in an Oracle database. The sections that follow show each SQL statement and its related syntax.
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 · How to use CASE for IF-THEN logic in SQL SELECT. If you want to see the grade for each exam, select the case expression like a regular column: It’s a good idea to give the expression an alias. This is particularly important if the case is in a subquery.
This document provides a cheat sheet of Oracle SQL functions organized into categories such as aggregate functions, numeric and math functions, conversion functions, and date and time functions. It lists over 100 functions with brief descriptions of what each function does.
Conversion Functions. BIN_TO_NUM ( expression_list ) CAST ( expression AS type_name ) CAST ( MULTISET (subquery) AS type_name ) COALESCE ( expr1, expr2, [expr...]
