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`)
);sql primary key
-- 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;Copyright © 2021 Codeinu
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