In this post, we describe the most popular Sql commands.
How to Install MySql
Please refer to this post on the process of installing Mysql database.
The most popular MySql Commands
Here are some of the most popular SQL commands we have to know.
Database Level Mysql Commands
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-- Database-Level DROP DATABASE databaseName -- Delete the database (irrecoverable!) DROP DATABASE IF EXISTS databaseName -- Delete if it exists CREATE DATABASE databaseName -- Create a new database CREATE DATABASE IF NOT EXISTS databaseName -- Create only if it does not exists SHOW DATABASES -- Show all the databases in this server USE databaseName -- Set the default (current) database SELECT DATABASE() -- Show the default database SHOW CREATE DATABASE databaseName -- Show the CREATE DATABASE statement |
Table Level Mysql Commands
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-- Table-Level DROP TABLE [IF EXISTS] tableName, ... CREATE TABLE [IF NOT EXISTS] tableName ( columnName columnType columnAttribute, ... PRIMARY KEY(columnName), FOREIGN KEY (columnNmae) REFERENCES tableName (columnNmae) ) SHOW TABLES -- Show all the tables in the default database DESCRIBE|DESC tableName -- Describe the details for a table ALTER TABLE tableName ... -- Modify a table, e.g., ADD COLUMN and DROP COLUMN ALTER TABLE tableName ADD columnDefinition ALTER TABLE tableName DROP columnName ALTER TABLE tableName ADD FOREIGN KEY (columnNmae) REFERENCES tableName (columnNmae) ALTER TABLE tableName DROP FOREIGN KEY constraintName SHOW CREATE TABLE tableName -- Show the CREATE TABLE statement for this tableName |
Row Level Mysql Commands
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-- Row-Level INSERT INTO tableName VALUES (column1Value, column2Value,...) -- Insert on all Columns INSERT INTO tableName VALUES (column1Value, column2Value,...), ... -- Insert multiple rows INSERT INTO tableName (column1Name, ..., columnNName) VALUES (column1Value, ..., columnNValue) -- Insert on selected Columns DELETE FROM tableName WHERE criteria UPDATE tableName SET columnName = expr, ... WHERE criteria SELECT * | column1Name AS alias1, ..., columnNName AS aliasN FROM tableName WHERE criteria GROUP BY columnName ORDER BY columnName ASC|DESC, ... HAVING groupConstraints LIMIT count | offset count |
How to Create and Delete a MySQL Database
MySQL organizes its information into databases; each one can hold tables with specific data. The show database command can help you quickly check what databases are available
SHOW DATABASES;
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