MySQL Tutorial => ALTER COLUMN OF TABLE

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MySQL

  • Getting started with MySQL
  • Awesome Book
  • Awesome Community
  • Awesome Course
  • Awesome Tutorial
  • Awesome YouTube
  • ALTER TABLE
    • ALTER COLUMN OF TABLE
    • ALTER table add INDEX
    • Change auto-increment value
    • Change column definition
    • Changing storage engine; rebuild table; change file_per_table
    • Changing the type of a primary key column
    • Renaming a column in a MySQL table
    • Renaming a MySQL database
    • Renaming a MySQL table
    • Swapping the names of two MySQL databases
  • Arithmetic
  • Backticks
  • Backup using mysqldump
  • Change Password
  • Character Sets and Collations
  • Clustering
  • Comment Mysql
  • Configuration and tuning
  • Connecting with UTF-8 Using Various Programming language.
  • Converting from MyISAM to InnoDB
  • Create New User
  • Creating databases
  • Customize PS1
  • Data Types
  • Date and Time Operations
  • Dealing with sparse or missing data
  • DELETE
  • Drop Table
  • Dynamic Un-Pivot Table using Prepared Statement
  • ENUM
  • Error 1055: ONLY_FULL_GROUP_BY: something is not in GROUP BY clause ...
  • Error codes
  • Events
  • Extract values from JSON type
  • Full-Text search
  • Group By
  • Handling Time Zones
  • Indexes and Keys
  • INSERT
  • Install Mysql container with Docker-Compose
  • Joins
  • JOINS: Join 3 table with the same name of id.
  • JSON
  • Limit and Offset
  • LOAD DATA INFILE
  • Log files
  • Many-to-many Mapping table
  • MyISAM Engine
  • MySQL Admin
  • MySQL client
  • MySQL LOCK TABLE
  • Mysql Performance Tips
  • MySQL Unions
  • mysqlimport
  • NULL
  • One to Many
  • ORDER BY
  • Partitioning
  • Performance Tuning
  • Pivot queries
  • PREPARE Statements
  • Recover and reset the default root password for MySQL 5.7+
  • Recover from lost root password
  • Regular Expressions
  • Replication
  • Reserved Words
  • Security via GRANTs
  • SELECT
  • Server Information
  • SSL Connection Setup
  • Stored routines (procedures and functions)
  • String operations
  • Table Creation
  • Temporary Tables
  • Time with subsecond precision
  • Transaction
  • TRIGGERS
  • UNION
  • UPDATE
  • Using Variables
  • VIEW
MySQL ALTER TABLE ALTER COLUMN OF TABLE

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Example

CREATE DATABASE stackoverflow; USE stackoverflow; Create table stack( id_user int NOT NULL, username varchar(30) NOT NULL, password varchar(30) NOT NULL ); ALTER TABLE stack ADD COLUMN submit date NOT NULL; -- add new column ALTER TABLE stack DROP COLUMN submit; -- drop column ALTER TABLE stack MODIFY submit DATETIME NOT NULL; -- modify type column ALTER TABLE stack CHANGE submit submit_date DATETIME NOT NULL; -- change type and name of column ALTER TABLE stack ADD COLUMN mod_id INT NOT NULL AFTER id_user; -- add new column after existing column

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