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INFO MANAHEMENT 8

Structured Query Language

QuestionAnswer
standard language used to communicate with databases SQL
SQL ALLOWS USERS TO (ADMC) ACCESS DEFINE MANIPULATE CONTROL
SQL Commands DDL, DML, DQL
Uniquely identifies record PRIMARY KEY
Links tables FOREIGN KEY
Prevents empty values NOT NULL
Prevents duplicate values UNIQUE
Sets default values DEFAULT
what kind of data a column can store Datatypes
Commands are used to define and manage database structures Data Definition Command
Commands Usage in DDL CREATE, ALTER, DROP, TRUNCATE (CADT)
commands are used to work with the data inside tables Data Manipulation Commands
Commands Usage in DML INSERT UPDATE DELETE SELECT (IUDS)
the most commonly used SQL command. SELECT Queries
Commands used in Select Queries SELECT ORDER DISTINCT LIMIT GROUP BY HAVING WHERE
To retrieve or create a statement by filtering data of a column. Used with () Aggregate Functions
Returns the number of rows in a set. COUNT
Returns the total sum of a numerical column. SUM
Returns the average value of a numerical column. AVG
Returns the smallest value within the selected column MIN
Returns the largest value within the selected column. MAX
A named rule applied to a table to enforce data integrity. CONSTRAINT
Specifies the parent table and column that the foreign key depends on. REFERENCES
Automatically deletes dependent records when the referenced primary key is deleted ON DELETE CASCADE
Prevents duplicate records based on a combination of columns UNIQUE
Created by: user-1782765
 

 



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