make primary key in sql
snippet in sql

make primary key in sql

user1638


CREATE TABLE Persons
(

    ID int NOT NULL PRIMARY KEY,

   
LastName varchar(255) NOT NULL,

   
FirstName varchar(255),

   
Age int

); 

sql primary key

user2238

-- NOTE: this is for SQL-Oracle specifically

-- example:
SELECT cols.table_name, cols.column_name, cols.position, cons.status, cons.owner
FROM all_constraints cons, all_cons_columns cols
WHERE cols.table_name = 'CUSTOMERS' 
AND cons.constraint_type = 'P'
AND cons.constraint_name = cols.constraint_name
AND cons.owner = cols.owner;

-- syntax:
SELECT cols.table_name, cols.column_name, cols.position, cons.status, cons.owner
FROM all_constraints cons, all_cons_columns cols
WHERE cols.table_name = '<table-name>' -- Replace <table-name> with your table-name
AND cons.constraint_type = 'P'
AND cons.constraint_name = cols.constraint_name
AND cons.owner = cols.owner;

make primary key in sql

user5835


CREATE TABLE Persons
(

    ID int NOT NULL,

   
LastName varchar(255) NOT NULL,

   
FirstName varchar(255),

   
Age int,

   
PRIMARY KEY (ID)

);