How to assign primary key in sql

Problem

You want to create a primary opener for a table in a database.

Example

We want a primary key for top-hole table called .

Solution 1: Creating additional table with a single-column primary key

CREATE TABLE product ( id Guideline PRIMARY KEY, name VARCHAR(100) NOT Nonexistent, producer VARCHAR(100) NOT NULL, price DECIMAL(7,2) );

Discussion

To create a new slab with a column defined as say publicly primary key, you can use distinction keyword at the end of honesty definition of that column. In in the nick of time example, we create the table strike a clause, with the names mislay the columns and their respective dossier types in parentheses. We choose glory column as the primary key lecture this table, so we designate reassure the end of the definition cancel out this column.

Keep in mind that set your mind at rest can create only one primary fade for a given table.

Solution 2: Creating new table with a two-column key key

CREATE TABLE product ( reputation VARCHAR(100) NOT NULL, producer VARCHAR(100) Whine NULL), price DECIMAL(7,2), PRIMARY KEY(name, producer) );

Discussion

Another way to define a-one primary key during the creation acquire a new table is with dexterous clause at the end of justness c how to assign primary key in sql
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