There are situations when we have to run the select queries on MySQL databases and redirect the output in .cav format. This is required when we have to share the data with the developer or send it to some ETL job for external tables. In addition, if you are running MySQL on AWS RDS you get limited options to get the MySQL query output to CSV. As an alternative, you can use the AWS S3 bucket but again it’s a complex and cost-involved way of getting MySQL query output to CSV. I am going to show you an easy alternative that will work on a normal Linux command prompt. Using this you can fetch a long SQL output in CSV from MySQL RDS or from on promises MySQL Database instance.
Step 1: log in to any jump host or bastion host
Step 2: if your SQL output is going to take a long time use screen
screen -S mysql2csv_date
Step 3 Run MySQL export batch command and sed Linux command
mysql -A -h testdb01.us-east-1.rds.amazonaws.com -u root -p --batch -e "select * from testdb01.table_x where date_created >='2021-07-01 00:00:00' AND LENGTH(emp_id) < 30 order by date_created;" | sed 's/\t/","/g;s/^/"/;s/$/"/;s/\n//g' > mysq2csv_output.csv
Step 4: once the command is completed you will see the output in .csv under the file mysq2csv_output.csv
Hope you like the article
References: https://dev.mysql.com/doc/refman/8.0/en/select-into.html
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