Learn to use ALTER to drop a column only if it exists. >>>
Monthly Archives: August 2024
How to List Table Foreign Keys in SQL
Learn how to find the foreign keys in a table in MySQL, PostgreSQL, and SQL Server. >>>
How to Find the Engine for a Specific Table in MySQL?
Learn how to find the storage engine used for a specific table or all tables in our MySQL database. >>>
Creating Temporary Tables in a SELECT Statement Without a Separate CREATE TABLE
Learn how to create temporary tables directly within a SELECT statement in SQL. >>>
Conditionally Renaming a Column if It Exists in SQL
Learn how to rename a column only if it exists in MySQL and PostgreSQL. >>>
Commit, Rollback, Savepoint in MySQL
Learn to manage transactions in MySQL. >>>
Retrieving Data From the Last N Days in SQL
Learn to select rows from the last N days. >>>
Merging Two Rows in SQL
Learn how to combine data from two records into a single record in SQL. >>>
Deleting All Records Except the Top or Bottom N in SQL
Learn how to delete all rows from a table except the top or bottom few. >>>
Storing Data in MySQL as JSON
Explore various ways to store data as JSON in MySQL. >>>