With the help of SQL commands, we can query, filter, sort, join, group and modify the data in the database. SQL Commands SQL commands are categorized into 5 categories. DDL - Data Definition Language DQL - Data Query Language DML - Data Manipulation Language DCL - Data Control Language ...
1. Data Definition Language (DDL) DDL changes the structure of the table like creating a table, deleting a table, altering a table, etc. All the command of DDL are auto-committed that means it permanently save all the changes in the database. Here are some commands that come under DDL:...
Data Definition Language (DDL) Data Definition Language (DDL) commands are used for defining the database structure or schema. Let's look at some DDL commands with a simple example for each command. i. CREATE In SQL, the CREATE TABLE command is used to create a new table in the database...
In this section, we will be discussing types of SQL commands. SQL Commands are divided into five broad categories – DDL, DML, DCL, TCL, and DQL. Each category is further explained below: 1. Data Definition Language(DDL): The Data Definition Language is made up of SQL commands that can ...
Mainly there are 4 types of SQL language categories where different SQL quick references are used. 1. Data Definition Language(DDL) Commands CREATE ALTER DROP 2. Data Manipulation Language(DML) Commands INSERT UPDATE DELETE 3. Data Query Language(DQL) Commands ...
DDL stands for Data Definition Language. DDL commands are a set of statements used to manage the structure of databases instructured query language (SQL). These commands allow users to create, modify, and delete database objects such as tables, indexes, views, and schemas. Common DDL commands...
SQL commands are grouped into four major categories depending on their functionality: Data Definition Language (DDL) - These SQL commands are used for creating, modifying, and dropping the structure of database objects. The commands are CREATE, ALTER, DROP, RENAME, and TRUNCATE. Data Manipulation...
Now let us take a deeper dive into the TCL commands of SQL with the help of examples. All the queries in the examples will be written using the MySQL database. 1. COMMIT COMMIT command in SQL is used to save all the transaction-related changes permanently to the disk. Whenever DDL comm...
Connected to a transient in-memory database. Use ".open FILENAME" to reopen on a persistent database. sqlite> .open new_Database 1) DDL Commands : DDL stands for Data Definition Language. This is used to define the structure of the database. It include commands like create, alter and...
DDL – Data Definition Language DML – Data Manipulation Language TCL – Transaction Control Language Session Control Statements System Control Statements The Three Main Statement Types The three types of statements in SQL are: DDL DML TCL Let’s take a look at each of these statement types. ...