MySQL supports the IF, CASE, ITERATE, LEAVE LOOP, WHILE, and REPEAT constructs for flow control within stored programs. It also supports RETURN within stored functions. Many of these constructs contain other statements, as indicated by the grammar specifications in the following sections. Such ...
There is also aCASEexpression, which differs from theCASEstatementdescribed here. SeeSection 12.4, “Control Flow Functions”. TheCASEstatement cannot have anELSE NULLclause, and it is terminated withEND CASEinstead ofEND.
Data Definition Statements Distributed Recovery Observability Group Replication Performance Fine Tuning the Group Communication Thread Message Compression Flow Control MySQL Shell Using MySQL as a Document Store InnoDB Cluster MySQL NDB Cluster 7.5 and NDB Cluster 7.6 Partitioning Stored Object...
This topic provides reference information about flow control in SQL Server and Amazon Aurora MySQL, comparing their respective capabilities and syntax differences. You can use this guide to understand how to adapt your existing SQL Server flow control statements when...
This chapter provides tutorial notes and Control Flow Statements. Topics include decision-making statements: 'if' and 'switch' statements; looping statements: 'for', 'while' and 'do' statements; branching statements: 'break', 'continue', and 'return' sta
The CASE statement is one of the most common control flow expressions of MySQL. The case expression is used to implement the IF ELSE logic in the query. The CASE expression can be used in the SELECT, WHERE, and ORDER BY clause. There are two variants of the CASE expression. The simple...
Provided that these conditions are met, The Group Replication Flow Control Statistics component can be installed and uninstalled usingINSTALL COMPONENTandUNINSTALL COMPONENT, respectively. See the descriptions of these statements, as well asSection 7.5.1, “Installing and Uninstalling Components”, for mor...
In Java, the "if" statement is used to evaluate a condition. The control of the program is diverted depending upon the specific condition. The condition of the If statement gives a Boolean value, either true or false. In Java, there are four types of if-statements given below. ...
The OR operator can cause unintentional problems in if statements, because the second operand will not be evaluated if the first is evaluated as TRUE. In Example 4-17, the function getnext will never be called if $finished has a value of 1. Example 4-17. A statement using the OR operat...
Enter the SQL statements that will be run on the database. It's usually a good idea to verify the SQL code in MySQL itself before pasting it into the MySQL event monitor. Alert if the query takes more than a specified time to complete...