- Trending Categories
- 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
Check if table exists in MySQL and display the warning if it exists?
To check if table exists, use the following syntax −
CREATE TABLE IF NOT EXISTS yourTableName ( yourColumnName1 dataType, . . . . N );
Here, we will try to create a table that already exists and then it will produce a warning message “Table already exists”. Let us first create a table. This table already exists −
mysql> CREATE TABLE IF NOT EXISTS DemoTable ( Id int ); Query OK, 0 rows affected, 1 warning (0.06 sec)
The warning message is as follows −
mysql> show warnings;
Output
+-------+------+-------------------------------------+ | Level | Code | Message | +-------+------+-------------------------------------+ | Note | 1050 | Table 'DemoTable' already exists | +-------+------+-------------------------------------+ 1 row in set (0.00 sec)
If table does not already exist, then it will get created −
mysql> CREATE TABLE IF NOT EXISTS DemoTable2 ( Id int ); Query OK, 0 rows affected (0.71 sec)
Advertisements