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SQL Constraints

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naly moslih answered on January 7, 2021 Popularity 10/10 Helpfulness 2/10

answer SQL Constraints

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SQL Constraints

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CREATE TABLE table_name (
    column1 datatype constraint,
    column2 datatype constraint,
    column3 datatype constraint,
    ....
);

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Contributed on May 23 2022

naly moslih

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NOT NULL 	 # Ensures a column cannot have a NULL value
UNIQUE 		 # Ensures all values in a column are unique
PRIMARY KEY  # Identifies a record in a table, is NOT NULL & UNIQUE
FOREIGN KEY  # References a unique record from another table
CHECK		 # Ensures all column values satisfy a condition
DEFAULT		 # Set a default value for a column if none is entered
INDEX		 # Quick way of retrieving records from database

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Contributed on Jan 07 2021

Obedient Ocelot

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constraints in sql

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RULES ABOUT THE COLUMNS IN TABLE
NOT NULL 	 # Ensures a column cannot have a NULL value
UNIQUE 		 # Ensures all values in a column are unique
PRIMARY KEY  # Identifies a record in a table, is NOT NULL & UNIQUE
FOREIGN KEY  # References a unique record from another table
CHECK		 # Ensures all column values satisfy a condition
DEFAULT		 # Set a default value for a column if none is entered
INDEX		 # Quick way of retrieving records from database

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Contributed on Jan 07 2021

Obedient Ocelot

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sql constraints

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# Constraints Keywords in a table
NOT NULL 	 # Ensures a column cannot have a NULL value
UNIQUE 		 # Ensures all values in a column are unique
PRIMARY KEY  # Identifies a record in a table, is NOT NULL & UNIQUE
FOREIGN KEY  # References a unique record from another table
CHECK		 # Ensures all column values satisfy a condition
DEFAULT		 # Set a default value for a column if none is entered
INDEX		 # Quick way of retrieving records from database

# Names of constraints:
# Entity integrity constraint : Makes sure that records are unique
# Referential integrity constraint : Defines relationships between tables
# Domain constraint : Permissible values (You cannot enter char in boolean column)
# Semantic integrity constraint : Correctness of data 
# Null constraint : Whether null is allowed
# Check constraint : Limits acceptance values (If today is in year 2023, you cannot enter 2050 in year column)

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Contributed on Feb 19 2023

Innocent Iguana

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SQL Constraints

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