Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
What will happen if we have set UNIQUE and multiple insertion with duplicate values
An error will arise and nothing will get inserted in the table Let us see an example and create a table −
mysql> create table DemoTable1585 -> ( -> StudentId int, -> StudentMarks int, -> UNIQUE(StudentId) -> ); Query OK, 0 rows affected (1.02 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable1585 values(1,87),(2,98),(3,91),(3,48); ERROR 1062 (23000): Duplicate entry '3' for key 'StudentId'
Display all records from the table using select statement −
mysql> select * from DemoTable1585;
This will produce the following output. Nothing gets inserted:
Empty set (0.00 sec)
Updated on: 16-Dec-2019
76 Views
Advertisements