Free Back-End Development Technical (SQL) Questions and Answers

Question 1

What exactly does SQL mean?

Accepted Answer

Structured Query Language

Answer

SQL stands for Structured Query Language, the standard language for querying and managing relational databases. The 'Question Language' variants are incorrect — the 'Q' is for Query, not Question.

Question 2

Which SQL command is employed to retrieve data from a database?

Accepted Answer

Select

Answer

Explanation:
The SELECT statement is used to extract data from a database. It allows you to specify which columns you want to retrieve from a table and any filtering criteria or sorting instructions that you want to apply to the data.

Question 3

How does one update data in a database using SQL?

Accepted Answer

Update

Answer

Explanation:
The UPDATE statement is used to modify or update data in a database. It allows you to specify which table you want to update, which columns you want to modify, and the new values you want to set for those columns.

Question 4

How do you delete data from a database using SQL?

Accepted Answer

DELETE

Answer

Explanation:
The DELETE statement is used to delete data from a database. It allows you to specify which table you want to delete data from and any filtering criteria to identify which rows should be deleted.

Question 5

Which SQL statement is employed when new data is to be added to a database?

Accepted Answer

Insert Into

Answer

Explanation:
The INSERT INTO statement is used to insert new data into a database. It allows you to specify which table you want to insert data into and the values that should be inserted into each column.

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Free Back-End Development Technical (SQL) Questions and Answers