Many a time you need to calculate rank in MySQL. You can order by a number but can’t calculate rank in MySQL easily. Here’s a query you can use.
You can easily copy data into new table in MySQL using SELECT INTO. This helps you create temporary tables quickly.
You may need to copy data from one table into another. You can insert data from one table into another in MySQL.You can use the INSERT INTO SELECT statement
Sometimes you may need to select data from a table and insert into same table in MySQL. You may need to quickly create lot of data for testing.
A bulk insert in MySQL is when you need to insert a lot of records in a table. You may need to do it to quickly create data for testing.
To calculate age from date you can use the following MySQL query. This is useful to find out recency of activity. Just replace with your column names.
Calculating difference between two dates in MySQL is really easy. Here’s how you can do it. Let’s say dt1 and dt2 are 2 columns in table table_name.
MySQL IN clause can be used instead of using OR operator with Where clause. It can be used when where clause is applied for multiple values for same column in an SQL query.
The basic use of MySQL IN statement deals with one column being compared to multiple values. There are also couple of advanced uses which make interesting use cases.
Sometimes you may need to keep track of largest table in MySQL database to optimize it. Here’s an SQL query to find the largest table in MySQL database