add primary key to existing table sql
alter table Persion add primary key (persionId,Pname,PMID)add primary key to existing table sql
alter table Persion add primary key (persionId,Pname,PMID)add primary key to existing table sql
ALTER TABLE `tblauto`
ADD PRIMARY KEY (`id`);
--what is primary key
PRIMARY KEY -- unique identifier for the entire row of record in a table
-- can not be null and must be uniqueCopyright © 2021 Codeinu
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