How to set the primary key self-increment by navicat

This article mainly introduces how to set the primary key of navicat from increment, the article is very detailed, has a certain reference value, interested friends must read!

1. Find the table you want to operate on. Right click to find the design table.

2. Find the corresponding field, change it to int type, check the automatic increment below, check it (note, the data type must be int type)

extended information

A primary key is one or more fields in a table whose value uniquely identifies a record in the table. In a relationship between two tables, a primary key is used to refer in one table to a particular record from the other table. A primary key is a unique key that is part of the table definition. The primary key of a table can be composed of multiple keywords, and the column of the primary keyword cannot contain null values. Primary keywords are optional and can be defined in CREATE TABLE or ALTER TABLE statements.

Its functions include

1) guarantee the integrity of the entity;

2) Speed up database operations;

3) When adding a new record to the table, ACCESS will automatically check the primary key value of the new record, and it is not allowed to duplicate the primary key value of other records;

4)ACCESS automatically displays the records in the table in the order of their primary key values. If no primary key is defined, the records in the table are displayed in the order in which they were entered.

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