The UPDATE and SET commands help to update existing field values in MySQL. You can use these commands to add/subtract value to/from existing field value in a single query in MySQL. Use the GREATEST() method with the UPDATE and SET command to subtract the value from an existing field in MySQL but not a negative value.

MySQL RAND() function provides an easy way to select random rows from the table. You can get random records from the database using a single SQL query in MySQL. If you want to list the unique data on each page load, the random records feature is very useful. Use MySQL RAND() function to select random records from the table.

When you use LIKE operator to search and fetch the matched results from the database, the records are selected based on their entry. In LIKE search, the results must be sorted based on the word matches to make the result-set more relevance. Use ORDER BY keyword with LIKE to sort results by the best match in MySQL.

The SHOW COLUMNS syntax shows the information about columns in a specified table. The INFORMATION_SCHEMA is the best way to get the columns of a table in MySQL. If you want to get the table columns from the PHP script, use INFORMATION_SCHEMA to select column names from a table in MySQL.

MySQL INSERT … SELECT statement provides an easy way to insert rows into a table from another table. If you want to copy data from one table to another in the same database, use INSERT INTO SELECT statement in MySQL.

Are you want to delete duplicate rows from MySQL table? Using one MySQL query, you can remove duplicate records from table.