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

2022-07-06 12:08:00 【Onion love code】

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

List of articles

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

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2、 Modify the name of the table

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3、 Change the data type of the field

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4、 Add fields

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5、 Delete field

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6、 Modify the sorting position of the field

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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 "

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