Advanced learning of MySQL -- Application -- view, stored procedure, trigger

These three are called MSQL Storage objects in , There is also a storage function

View

A view is a virtual table , The data in the view does not actually exist in the database , But in the actual table , The view just says , The representation of a data we query . It's generated dynamically .
In short , View does not save data , It saves the query SQL The logic of , The source of data is the basic table , Called base table , So when we create views , The main task of is to create this query SQL On statement .

establish

create [or replace] view View name [( List of names )] as select sentence [with [cascaded|local] check option]

Check options

cascade

Local

to update

The function of view

View case

stored procedure

What is stored procedure , What's the use

Basic grammar

Variable - System variables

Variable - User defined variables

Variable - local variable

if Judge

Parameters (in, out, inout)

case

while

repeat

loop

cursor

Condition handler -handler

Storage function

trigger

Case study 1(insert)

Case study 2(update)

Case study 3(delete)