Basic operations of databases and tables ----- modifying data tables

Basic operation of database and table ----- Modify data sheet

** Review the contents of Chapter II **

Basic operation of database and table ----- Create and view databases
Basic operation of database and table ----- Modifying and deleting databases
Basic operation of database and table ----- Classification of data
Basic operation of database and table ----- Create data table
Basic operation of database and table ----- Look at the data sheet
Basic operation of database and table ----- Modify data sheet
Basic operation of database and table ----- Delete data table
Basic operation of database and table ----- Primary key constraint
Basic operation of database and table ----- Non empty constraint
Basic operation of database and table ----- Unique constraint
Basic operation of database and table ----- Default constraint
Basic operation of database and table ----- Set the field value of the table to increase automatically
Basic operation of database and table ----- The concept of index
Basic operation of database and table ----- Create index
Basic operation of database and table ----- Delete index
Basic operation of database and table ----- Phased test II

Preface full name : Onion love code like :Java Programming Important things are to be repeated for 3 times !!! Welcome to visit , learn from each other Welcome to visit , learn from each other Welcome to visit , learn from each other Let's learn about database !!!

Cuddle wood , Born in the end ; A hundred feet platform , From the soil ; A journey , Begins with a single step .------《 Lao tze 》
Today's learning task ！！！！！
1、 Master creating data table

One 、 Modify data sheet

1、 Modify the name of the table

2、 Modify the name of the table

3、 Change the data type of the field

4、 Add fields

5、 Delete field

6、 Modify the sorting position of the field

One quart a day ！！！
Just as Xue Zhiqian is not easy to praise Mao
" You are now a meteor " , But I believe you , If you stick to it, you're a superstar "