WebCreate a table with the name as DEPT by using PRIMARY KEY constraint (Parent table) CREATE TABLE Dept ( Dno INT PRIMARY KEY, Dname VARCHAR(30), Dloc CHAR(40) ) GO Now insert some values into the Parent table like below INSERT Dept VALUES (10, '.NET', 'HYD') INSERT Dept VALUES (20, 'JAVA', 'PUNE') INSERT Dept VALUES (30, … WebTo create a PRIMARY KEY constraint on the "ID" column when the table is already created, use the following SQL: MySQL / SQL Server / Oracle / MS Access: ALTER TABLE Persons ADD PRIMARY KEY (ID); To allow naming of a PRIMARY KEY constraint, and for defining a PRIMARY KEY constraint on multiple columns, use the following SQL syntax:
SQL : How to generate create script of tables with their constraints ...
WebJan 9, 2014 · SQL Server Constraints can be defined as rules that govern the values that are inserted into a column. These rules help in enforcing data integrity. For example if a NOT NULL constraint is defined over a column in a particular table, it means that column will not accepted any NULL values. WebSQL Default Constraint - In general, a default constraint is useful when the value has not been passed in the column that is specified with a default constraint. Then the column data will automatically be filled with the default value. puppies yorkie
Create Foreign Key Relationships - SQL Server Microsoft Learn
WebNov 23, 2024 · The following SQL creates a UNIQUE constraint in the columns ‘Sale_Id’ when the table ‘Sales’ is created in various relational databases: SQL Server / Oracle / MS Access: CREATE TABLE Sales ( Sale_Id int NOT NULL UNIQUE, Sale_Amount int NOT NULL, Vendor_Name varchar (255) NOT NULL, Sale_Date date, Profit int ); MySQL: WebThe following example creates a table with NOT NULL constraints for the columns: first_name, last_name, and email: CREATE SCHEMA hr; GO CREATE TABLE hr.persons ( person_id INT IDENTITY PRIMARY KEY , first_name VARCHAR ( 255) NOT NULL , last_name VARCHAR ( 255) NOT NULL , email VARCHAR ( 255) NOT NULL , phone … WebSQL Default Constraint - In general, a default constraint is useful when the value has not been passed in the column that is specified with a default constraint. Then the column … puppiing