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constraints in sql

By KaotikKaotik on Apr 05, 2020
# The most common constraints are
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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constraint

By Nutty NightingaleNutty Nightingale on Nov 25, 2020
print("hello world");
alert(print);

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