Answers for "how to return null in sql"

SQL
2

Select without null values sql

SELECT column_names
FROM table_name
WHERE column_name IS NOT NULL;
Posted by: Guest on July-14-2020
0

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
);
Posted by: Guest on April-21-2020
0

get null value in sql

SELECT * FROM my_table WHERE col1 IS NULL;
Posted by: Guest on May-08-2021

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