How to import data with empty values in MySQL?

When importing data with null values into a MySQL database, you can use the LOAD DATA INFILE statement or use MySQL tools such as MySQL Workbench or phpMyAdmin.

When importing data using the LOAD DATA INFILE statement, you can represent empty values as NULL, for example:

LOAD DATA INFILE 'path/to/file.csv'
INTO TABLE table_name
FIELDS TERMINATED BY ',' 
ENCLOSED BY '"'
LINES TERMINATED BY '\n'
(column1, column2, @var1)
SET column3 = IF(@var1 = '', NULL, @var1);

In the example above, column1 and column2 are columns containing null values, and @var1 is a variable used to store the values of these columns. The SET clause is then used to set column3 to NULL, and if @var1 is an empty string, it will also be set to NULL.

If using MySQL tools like MySQL Workbench or phpMyAdmin, you can directly import data files containing empty values. These tools usually provide options to specify how empty values are represented.

Please ensure that the columns of the target table allow null values before importing data, as failure to do so will result in import failure.