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SQL NOT NULL Constraint

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SAMER SAEID answered on April 21, 2020 Popularity 9/10 Helpfulness 2/10

answer SQL NOT NULL Constraint

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SQL NOT NULL Constraint

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CREATE TABLE Colleges (
  college_id INT NOT NULL,
  college_code VARCHAR(20),
  college_name VARCHAR(50)
);

Popularity 9/10 Helpfulness 2/10 Language sql

Source: Grepper

Tags: null sql

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Contributed on May 22 2022

SAMER SAEID

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how to add not null constraint in sql

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ALTER TABLE table_name MODIFY column_name datatype NOT NULL;

Popularity 10/10 Helpfulness 7/10 Language sql

Source: www.tutorialspoint.com

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Contributed on Apr 05 2021

Enthusiastic Echidna

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sql not null

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SELECT column_name FROM table_name 
WHERE column_name IS NOT NULL;

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Source: Grepper

Tags: null

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Contributed on Dec 07 2020

Nikky Amresh

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sql is not null

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# IS NULL
SELECT column_names FROM table_name WHERE column_name IS NULL;
# IS NOT NULL
SELECT column_names FROM table_name WHERE column_name IS NOT NULL;

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Source: Grepper

Tags: null

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Contributed on Apr 29 2023

Shadow

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add not null constraint sql server

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ALTER TABLE table1 ALTER COLUMN column1 datatype NOT NULL;

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Source: Grepper

Tags: add null nul

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Contributed on Aug 29 2022

Wrong Willet

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sql is not null

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SELECT * FROM my_table WHERE my_column IS NOT NULL;

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Source: Grepper

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Contributed on Apr 21 2021

VasteMonde

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SQL NOT NULL Constraint

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CREATE TABLE Persons (
    ID int NOT NULL,
    LastName varchar(255) NOT NULL,
    FirstName varchar(255) NOT NULL,
    Age int
);

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Source: Grepper

Tags: null

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Contributed on May 23 2022

naly moslih

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NOT NULL SQL

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By default, a column can hold NULL values.
The NOT NULL constraint enforces a column to NOT accept NULL values.
This enforces a field to always contain a value, which means that you cannot insert a new record, or update a record without adding a value to this field.

Sql NOT NULL in creating a table
CREATE TABLE Persons (
    ID int NOT NULL,
    LastName varchar(255) NOT NULL,
    FirstName varchar(255) NOT NULL,
    Age int
);

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Source: Grepper

Tags: null

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Contributed on Apr 21 2020

Ankur

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SQL NOT NULL Constraint

Comment

CREATE TABLE Colleges (
  college_id INT NOT NULL,
  college_code VARCHAR(20) NOT NULL,
  college_name VARCHAR(50)
);

Popularity 9/10 Helpfulness 2/10 Language sql

Source: Grepper

Tags: null

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Contributed on May 22 2022

SAMER SAEID

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sql is not null

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The reverse of NULL. Tests for values that aren’t empty / NULL
"Tests for empty (NULL) values.
Example: Returns users that haven’t given a contact number.
SELECT * FROM users
WHERE contact_number IS NULL;"

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Source: Grepper

Tags: null

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Contributed on Jan 07 2021

Lorenzo Satta Chiris

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SQL NOT NULL Constraint

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