SQL Assignment & Interview Queries with Solutions (example) | MySQL Database part 2

Publicado em: 14 Janeiro 2024
no canal de: All about data

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SQL Assignment & Interview Queries with Solutions (example) | MySQL Database part 2

Part 1 :    • SQL Assignment & Interview Queries wi...

Views in Sql :    • Chapter-18 : Views in SQL with exampl...

Exception & Error handling in sql :    • Chapter-22 : Exception / Error handli...

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Data Manipulation Language (DML):

SELECT: Retrieves data from a database.
INSERT: Adds new data to a table.
UPDATE: Modifies existing data in a table.
DELETE: Removes data from a table.
Data Definition Language (DDL):

CREATE: Creates database objects like tables, views, indexes, and users.
ALTER: Modifies the structure of existing database objects.
DROP: Deletes database objects.
TRUNCATE: Removes all data from a table without deleting the table structure.
Data Control Language (DCL):

GRANT: Gives users permission to perform actions on database objects.
REVOKE: Revokes permissions from users.
Common Query Clauses:

WHERE: Specifies conditions for filtering data.
ORDER BY: Sorts the results of a query.
GROUP BY: Groups data together based on specified columns.
HAVING: Filters groups based on aggregate functions.
Joining Tables:

INNER JOIN: Combines rows from two tables based on a common column.
LEFT JOIN: Includes all rows from the left table, even if there's no match in the right table.
RIGHT JOIN: Includes all rows from the right table, even if there's no match in the left table.
FULL JOIN: Includes all rows from both tables, regardless of whether there's a match.
Other Common Commands:

USE: Selects a database to work with.
SHOW: Displays information about database objects.
DESCRIBE: Provides details about the structure of a table.
COMMIT: Saves changes made to the database.
ROLLBACK: Reverts changes made to the database.

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