11-20 câu SQL

Study Notes

Stored Procedure

Pre-compiled set of SQL statements
Stored in the database
Can be executed by name

SQL Statement Error

job-CLERK should be job='CLERK'
Comparison operator = needs to be used
Quotes are needed to enclose the string value

Count in SQL

COUNT(*) function returns the number of rows in the table even if they contain null values
In this case, the output will be 10

SQL INSERT Statement

INSERT INTO statement is used to add new rows to the table

LIKE Keyword

The LIKE keyword is used with wildcard characters (%) or underscore (_) to match patterns in data

Using a Database Management System

To manage data effectively
To ensure data integrity
To control access to data
To improve performance and security

SQL SELECT Statement

SELECT * FROM Contest WHERE ContestDate >= '2006-05-25'
Date should be in the format YYYY-MM-DD

REVOKE Privilege

REVOKE ALL ON SUPPLIERS FROM Manager;
This will remove all privileges from the Manager user on the SUPPLIERS table

Database Index

An index is a data structure that helps to speed up data retrieval
It stores the values of one or more columns in a sorted order
Used to create efficient search conditions

Join Types

Inner Join
Left Join
Right Join
Full Join

Description

This quiz explores what stored procedures are in the context of database management. Participants will learn their definition, purpose, and how they contribute to efficient database operations. Test your knowledge about stored procedures and their applications.