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10 sty 2012 · It has to do with the Normal Form for the SQL language. IF statements can, by definition, only take a single SQL statement. However, there is a special kind of SQL statement which can contain multiple SQL statements, the BEGIN-END block.
The IF ELSE statement. When the condition in the IF clause evaluates to FALSE and you want to execute another statement block, you can use the ELSE clause. The following illustrates the IF ELSE statement: IF Boolean_expression.
CREATE OR REPLACE PROCEDURE total_val (IN Member# CHAR(6), OUT total DECIMAL(12,2)) LANGUAGE SQL BEGIN. SELECT SUM(curr_balance) INTO total FROM accounts WHERE account_owner=Member# AND account_type IN ('C','S','M'); END. CALL it from an SQL interface.
12 wrz 2022 · Learn how to build conditional logic when writing SQL code using IF, BEGIN, END, ELSE, and ELSEIF logic.
1 cze 2021 · Standard SQL Functions Cheat Sheet. TEXT FUNCTIONS. CONCATENATION. Use the || operator to concatenate two strings: SELECT 'Hi ' || 'there!'; -- result: Hi there! Remember that you can concatenate only character strings using ||. Use this trick for numbers: SELECT '' || 4 || 2; -- result: 42.
1 cze 2021 · CAST(123 AS decimal) / 2 Division by 0 To avoid this error, make sure that the denominator is not equal to 0. You can use the . NULLIF() function to replace 0 with a NULL, which will result in a NULL for the whole expression: count / NULLIF(count_all, 0) Inexact calculations If you do calculations using . real (floating point) numbers, you'll
SQL Tutorial. Home Next . SQL is a standard language for storing, manipulating and retrieving data in databases. Our SQL tutorial will teach you how to use SQL in: MySQL, SQL Server, MS Access, Oracle, Sybase, Informix, Postgres, and other database systems. Start learning SQL now » Examples in Each Chapter.
