“n'est pas nul SQL” Réponses codées

Sélectionnez sans valeurs nuls SQL

SELECT column_names
FROM table_name
WHERE column_name IS NOT NULL;
Sergiu The Man

Pas 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
);
Ankur

Contrainte SQL non nulle

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

SQL est nul et n'est pas nul

SELECT *
FROM Employee
WHERE email IS NULL;
SAMER SAEID

n'est pas nul 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)
Zarden

Contrainte SQL non nulle

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

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