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How MySQL evaluates if we export the data to CSV file from a table which contains a NULL value(s)?
If we export the data from a table having NULL values then MySQL will store \N in CSV file for the record MySQL table having NULL values. It can be illustrated with the help of the following example −
Example
Suppose if we want to export the values of the table ‘student_info’ having the following data −
mysql> Select * from Student_info; +------+---------+------------+------------+ | id | Name | Address | Subject | +------+---------+------------+------------+ | 101 | YashPal | Amritsar | History | | 105 | Gaurav | Chandigarh | Literature | | 125 | Raman | Shimla | Computers | | 130 | Ram | Jhansi | Computers | | 132 | Shyam | Chandigarh | Economics | | 133 | Mohan | Delhi | Computers | | 150 | Saurabh | NULL | Literature | +------+---------+------------+------------+ 7 rows in set (0.00 sec)
As we can see that the result has a NULL value for the address field where id is 150. Now the following query will export this table’s data into Student_27.CSV −
mysql> Select * from Student_info INTO OUTFILE 'C:/mysql/bin/mysql-files/student_27.csv' FIELDS TERMINATED BY ','; Query OK, 7 rows affected (0.02 sec)
The above query has stored following values in the file Student_27.CSV −
101 YashPal Amritsar History 105 Gaurav Chandigarh Literature 125 Raman Shimla Computers 130 Ram Jhansi Computers 132 Shyam Chandigarh Economics 133 Mohan Delhi Computers 150 Saurabh \N Literature
We can see that MySQL stores \N where the table has a NULL value(s).
Updated on: 07-Feb-2020
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