Answers for "how to check sqldatareader is null or not in c#"

SQL
10

sql not null

SELECT column_name FROM table_name 
WHERE column_name IS NOT NULL;
Posted by: Guest on December-07-2020
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

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