I've created SQL command that uses INNER JOIN on 9 tables, anyway this command takes a very long time (more than five minutes). So my folk suggested me to change INNER JOIN to LEFT JOIN because the performance of LEFT JOIN is better, despite what I know. After I changed it, the speed of query got si...

...on. A few things off the top of my head .... If you specify columns in a SQL statement, the SQL execution engine will error if that column is removed from the table and the query is executed. You can more easily scan code where that column is being used. You should always write queries to bring ba...

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...rom complete. So I decided to write my own script. I used the AWS CLI, MySQL and some “Bash-foo” to perform the following: Get a list of all EC2 security groups. I store the group-id, group-name and description in a tabled called “groups” in a MySQL database called aws_security_groups on...

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... SQL Server now supports the FORMAT function starting from version 2012, so: SELECT FORMAT(id, '0000') FROM TableA will do the trick. If your id or column is in a varchar and represents a number you convert first: SELECT...

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