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This chapter provides a tutorial introduction to MySQL by showing how to use the mysql client program to create and use a simple database. mysql (sometimes referred to as the “terminal monitor” or just “monitor”) is an interactive program that enables you to connect to a MySQL server, run queries, and view
Download this eBook for free Chapters. Chapter 1: Getting started with MySQL; Chapter 2: ALTER TABLE; Chapter 3: Arithmetic; Chapter 4: Backticks; Chapter 5: Backup using mysqldump; Chapter 6: Change Password; Chapter 7: Character Sets and Collations; Chapter 8: Clustering; Chapter 9: Comment Mysql; Chapter 10: Configuration and tuning
You can create a new table in the default database using command "CREATE TABLE tableName" and "DROP TABLE tableName". You can also apply condition "IF EXISTS" or "IF NOT EXISTS".
The ALTER TABLE statement is used to add, delete, or modify columns in an existing table. The ALTER TABLE statement is also used to add and drop various constraints on an existing table. ALTER TABLE - ADD Column
Use the ALTER TABLE statement to modify the table structure. To select data from a table, use the SELECT command. An example of a single-table query: SELECT species, AVG(age) AS average_age FROM animal. Use +, -, *, / to do some basic math. To get the number of seconds in a week: SELECT 60 * 60 * 24 * 7; -- result: 604800.
Table of Contents About 1 Chapter 1: Getting started with MySQL 2 Remarks 2 Versions 2 Examples 3 Getting Started 3 Information Schema Examples 7 Processlist 7 Stored Procedure Searching 7 Chapter 2: ALTER TABLE 8 Syntax 8 Remarks 8 Examples 9 Changing storage engine; rebuild table; change file_per_table 9 ALTER COLUMN OF TABLE 9 ALTER table ...
ALTER TABLE upgrades MySQL 5.5 temporal columns to 5.6 format for ADD COLUMN, CHANGE COLUMN, MODIFY COLUMN, ADD INDEX, and FORCE operations.
