SQL Interview Questions

Data control language allows you to control access to the database. DCL is the only subset of the database which decides that what part of the database should be accessed by which user at what point of time. It includes two commands GRANT and REVOKE. GRANT: to grant the specific user to perform a particular … Read more

Data manipulation language makes the user able to retrieve and manipulate data. It is used to perform the following operations. Insert data into database through INSERT command. Retrieve data from the database through SELECT command. Update data in the database through UPDATE command. Delete data from the database through DELETE command. In SQL, Data Manipulation … Read more

Data definition language (DDL) is the subset of the database which defines the data structure of the database in the initial stage when the database is about to be created. It consists of the following commands: CREATE, ALTER and DELETE database objects such as schema, tables, view, sequence, etc. In SQL, Data Definition Language (DDL) … Read more

There is three significant subset of the SQL: Data definition language (DDL):DDL is used to define the data structure it consists of the commands like CREATE, ALTER, DROP, etc. Data manipulation language (DML):DML is used to manipulate already existing data in the database. The commands in this category are SELECT, UPDATE, INSERT, etc. Data control … Read more

SQL refers to the Standard Query Language, which is not actually the programming language. SQL doesn’t have a loop, Conditional statement, logical operations, it can not be used for anything other than data manipulation. It is used like commanding (Query) language to access databases. The primary purpose of SQL is to retrieve, manipulate, update and … Read more