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Any query which works on any single record taken from a table can be wrapped in a procedure to make it run through each row of a table like so: First delete any existing procedure with the same name, and change the delimiter so your SQL doesn't try to run each line as you're trying to write the procedure.
I am trying to write a stored procedure in MySQL which will perform a somewhat simple select query, and then loop over the results in order to decide whether to perform additional queries, data transformations, or discard the data altogether. Effectively, I want to implement this:
29 sty 2024 · This guide explores how to use loops in MySQL, specifically utilizing the procedural language that comes with MySQL’s support for stored routines. Understanding Loop Constructs in MySQL. MySQL supports three kinds of loops: the LOOP, REPEAT, and WHILE loops, each serving different use cases.
MySQL 9.1 Reference Manual / ... / / / WITH (Common Table Expressions) 15.2.20 WITH (Common Table Expressions) A common table expression (CTE) is a named temporary result set that exists within the scope of a single statement and that can be referred to later within that statement, possibly multiple times. The following discussion describes how ...
15 maj 2016 · You SELECT the values you want to pass, from wherever you're getting them (which could be a temporary table, base table, or view, and can include calls to stored functions) and then call your existinf procedure with those values.
You will learn how to use the MySQL WHILE loop statement to execute one or more statements repeatedly as long as a condition is true.
25 paź 2019 · In this article, we learned the SQL WHILE loop with quite simple examples. We also virtualized and explained the examples with flowcharts. WHILE loop helps us to achieve iterative operations in SQL Server. At the same time, BREAK and CONTINUE statements can be used to control iteration of the WHILE loop in SQL Server.
