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Free online wide MCQ Exam for "SQL"

377+ questions to prepare...

SQL

About SQL

SQL-related questions covering queries, database design, normalization, and constraints.These focus on more advanced concepts, specific functions, database administration, and theory

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Frequently Asked Questions (FAQ)

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SQL (Structured Query Language) is the standard language for communicating with databases, allowing analysts to extract, manipulate, and analyze large datasets efficiently.

JOIN is used to combine columns from different tables based on a related column, while UNION is used to combine the result-sets of two or more SELECT statements vertically.

DELETE is a DML command that can be rolled back; TRUNCATE is a DDL command that removes all rows and cannot be rolled back easily.

SQL stands for Structured Query Language.

By using the DISTINCT keyword (e.g. SELECT DISTINCT column_name FROM table).

A field in one table that uniquely identifies a row of another table to establish a relationship.

It groups rows that have the same values into summary rows like 'find the number of customers in each country'.

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