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Use 'function recursion' to implement dynamic tree menu based on PHP and MySQL

Tree menus are widely used in many desktop application systems. Its main advantage is that the structure is clear, which helps users clearly know their current location.

Dec 14, 2016 pm 04:14 PM

SQL Server: Detailed explanation of triggers

A trigger is a special stored procedure that cannot be called explicitly, but is automatically activated when a record is inserted, updated, or deleted into the table. So triggers can be used to implement complex integrity constraints on tables.

Dec 14, 2016 pm 04:11 PM

SQL trigger examples explained

What is a trigger? In SQL Server, it is a program that performs a certain operation on a certain table, triggers a certain condition, and is executed. A trigger is a special stored procedure. There are three common triggers: applied to Insert, Update, and Delete events respectively.

Dec 14, 2016 pm 04:07 PM

sql trigger

SQL Server trigger creation, deletion, modification, view

Dec 14, 2016 pm 04:05 PM

SQL Server triggers

A trigger is a special type of stored procedure, which is different from the stored procedures we introduced before. Triggers are mainly triggered by events and are automatically called and executed. Stored procedures can be called by the name of the stored procedure.

Dec 14, 2016 pm 04:03 PM

sql trigger

The difference between stored procedures and functions in SQL Server

There is essentially no difference. It's just that the function has the restriction that it can only return one variable. The stored procedure can return multiple. Functions can be embedded in SQL and can be called in select, but stored procedures cannot. The essence of execution is the same.

Dec 14, 2016 pm 03:28 PM

SQL stored procedure definition and stored procedure benefits

reuse. Stored procedures can be reused, reducing the workload of database developers.

Dec 14, 2016 pm 03:26 PM

PL/SQL stored procedures and functions

Stored procedures are a type of subroutine that can complete some tasks and are stored in the database as schema objects. It is a named PL/SQL code block that supports receiving or not accepting parameters, and also supports parameter output. A stored procedure usually contains a definition part, an execution part, and an Exception part. It can be called by other subroutines and can also be reused.

Dec 14, 2016 pm 03:24 PM

SQL statement splicing in SQL stored procedures

This article introduces the splicing of SQL statements in SQL stored procedures.

Dec 14, 2016 pm 03:22 PM

sql stored procedure summary

In large database systems, stored procedures and triggers play an important role. Whether it is a stored procedure or a trigger, it is a collection of SQL statements and flow control statements. In essence, a trigger is also a stored procedure. Stored procedures generate execution modes during operation, so they execute very quickly when they are run again later. SQL Server 2000 not only provides the function of user-defined stored procedures, but also provides many system stored procedures that can be used as tools

Dec 14, 2016 pm 03:21 PM