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Tutorials > SQL > Data export and import

Data export and import

Data export and import are important operations in relational databases that allow you to transfer data between different databases or between a database and a file.

  • Data Export: Data export is the process of extracting data from a database and saving it to a file or another database. There are many formats that data can be exported to, including CSV, XML, and JSON.

Here's an example of how to export data from a database in SQL:

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SELECT * INTO OUTFILE '/tmp/employee_data.csv'
FIELDS TERMINATED BY ',' OPTIONALLY ENCLOSED BY '"'
LINES TERMINATED BY '\n'
FROM employees;

In this example, the SELECT statement is used to extract all data from the employees table and save it to a CSV file named /tmp/employee_data.csv. The FIELDS TERMINATED BY and LINES TERMINATED BY clauses specify the format of the exported data.

  • Data Import: Data import is the process of loading data from a file or another database into a database.

Here's an example of how to import data into a database in SQL:

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LOAD DATA INFILE '/tmp/employee_data.csv' INTO TABLE employees
FIELDS TERMINATED BY ',' OPTIONALLY ENCLOSED BY '"'
LINES TERMINATED BY '\n';

In this example, the LOAD DATA INFILE statement is used to load data from the CSV file /tmp/employee_data.csv into the employees table. The FIELDS TERMINATED BY and LINES TERMINATED BY clauses specify the format of the imported data.

Data export and import are useful for transferring data between different databases or for backing up and restoring data. However, it's important to be careful when importing data, as errors in the data or the import process can cause inconsistencies or corruption in the database.



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