Digicloud - SQL Queries Practice
SQL Queries are used for the majority of database operations that you must carry out. Data is fetched or retrieved from databases using SQL queries. It's extremely simple to learn SQL syntax, but it takes a lot of practice to become proficient at constructing SQL queries.Although many databases have developed their own versions of SQL, the majority of its functionality and syntax are shared by all of them; SQL is mostly utilized in RDBMS. RDBMS has multiple tables, and each table containing a collection of rows and columns to store data. Many tables will be related to one another through certain columns creating relationships in RDBMS.SQL commands are used to communicate with Database to perform specific functions and queries on data.There are 5 types of SQL commands used in SQL they are DDL, DML, DQL, DCL, TCL. These SQL commands are used to change the structure of the table.
DDL – Data definition Language used to Create, Alter, Drop, Truncate a table.
DML – Data Manipulation Language used to Insert, Update, Delete data in a table.
DQL – Data Query Language used to retrieving required information using SELECT command.
DCL – Data Control Language used to control the users access on Database using Grant and Revoke Commands.
TCL – Transaction Control Language used to commit/undo the transactions performed using Commit, Rollback, Savepoint commands.
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