Difference Between SQL And PL/SQL

SQL

SQL refers to simple statements like Insert, Create, Select, update which can be used to select and manipulate data from database.
SQL is Structured Query Language created to manipulate relational databases.
SQL is a declarative database.
There are no variables in SQL.
In SQL, a particular query is executed at a time. These queries can be insert, update, delete or select statements.
SQL statements can be inserted within the PL/SQL programs.
In SQL you can write queries and command using DDL, DML statements.
It interacts with the database server directly.

PL/SQL is a programmable version of SQL which provides lot of functionalities like loops, functions, variables, similar to other programmable languages like java, etc.
PL/SQL is a Procedural language/ programing language that uses SQL as its database.
PL/SQL is a procedural language that defines how things will execute.
PL/SQL has variable constraints, data types etc.
In PL/SQL, an entire block of code is executed at once.
PL/SQL code statements cannot be inserted in the SQL code.
In PL/SQL you can write block of code that has procedures, functions, triggers, packages, variables within its syntax.

BASIS OF COMPARISON	SQL	PL/SQL
Describe	SQL refers to simple statements like Insert, Create, Select, update which can be used to select and manipulate data from database.	PL/SQL is a programmable version of SQL which provides lot of functionalities like loops, functions, variables, similar to other programmable languages like java, etc.
Definition	SQL is Structured Query Language created to manipulate relational databases.	PL/SQL is a Procedural language/ programing language that uses SQL as its database.
Nature	SQL is a declarative database.	PL/SQL is a procedural language that defines how things will execute.
Variables	There are no variables in SQL.	PL/SQL has variable constraints, data types etc.
Execution of Code	In SQL, a particular query is executed at a time. These queries can be insert, update, delete or select statements.	In PL/SQL, an entire block of code is executed at once.
Interaction With Server	It interacts with the database server directly.	It cannot interact with the database server directly.
Insertion of Code Statement	SQL statements can be inserted within the PL/SQL programs.	PL/SQL code statements cannot be inserted in the SQL code.
Writing of Queries	In SQL you can write queries and command using DDL, DML statements.	In PL/SQL you can write block of code that has procedures, functions, triggers, packages, variables within its syntax.