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 in sql
Primary Key :
It is unique column in every table in a database
It can ONLY accept;
- nonduplicate values
- cannot be NULLCopyright © 2021 Codeinu
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