how to make multiple keys as primary in bdms
CREATE TABLE `Donor`(
`did` int(50) NOT NULL,
`oid` int(50) NOT NULL,
`dname` varchar(50) NOT NULL,
`dblood` varchar(50) NOT NULL,
PRIMARY KEY (`did`, `oid`)
);how to make multiple keys as primary in bdms
CREATE TABLE `Donor`(
`did` int(50) NOT NULL,
`oid` int(50) NOT NULL,
`dname` varchar(50) NOT NULL,
`dblood` varchar(50) NOT NULL,
PRIMARY KEY (`did`, `oid`)
);primary key multiple
CREATE TABLE Persons (
Rollno int NOT NULL,
FirstName varchar(30),
LastName varchar(30) NOT NULL,
class varhcar(20),
Age int,
CONSTRAINT PK_Student PRIMARY KEY (Rollno,LastName)
);Copyright © 2021 Codeinu
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