Q. What is SQL? What are different categories of commands available in SQL?
Answer =
In order to access data within the Oracle database, all programs and users must use, Structured Query Language (SQL). SQL is the set of commands that is recognized by nearly all RDBMS.
SQL commands can be divided into following categories:
1. Data Definition Language (DDL) Commands.
2. Data Manipulation Language (DML) Commands.
3. Transaction Control Language (TCL) Commands.
4. Session Control Commands.
5. System Control Commands.
SQL commands can be divided into following categories:
1. Data Definition Language (DDL) Commands.
2. Data Manipulation Language (DML) Commands.
3. Transaction Control Language (TCL) Commands.
4. Session Control Commands.
5. System Control Commands.
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