Is not null sql

Select without null values sql

SELECT column_names
FROM table_name
WHERE column_name IS NOT NULL;

NOT NULL SQL

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
);

Is not null sql

select c_custkey, c_name, c_address from customer where c_custkey in (select o_orderkey from orders where o_orderkey IS NOT NULL)

Similar codes

10 votes240 views2 answers
Sql pagination offset
SQL
6 votes235 views3 answers
Commit in sql
SQL
58 votes430 views6 answers
Create new user in postgres
SQL
0 vote229 views1 answer
How to reset the database value in SQL server
SQL
0 vote218 views1 answer
Sql roll up rows into columns
SQL
7 votes254 views1 answer
Oracle alter sequence restart start with
SQL
1 vote236 views4 answers
Psql: error: FATAL: database "odoo" does not exist
SQL
0 vote207 views1 answer
Hallo
SQL
7 votes228 views1 answer
Connect mysql docker
SQL
1 vote267 views2 answers
How to install mysql workbench in ubuntu 20.04
SQL