Learn how to count the number of unique values in a column using SQL. >>>
Monthly Archives: July 2024
Delete Using INNER JOIN in SQL
Learn how to use an INNER JOIN to delete data in SQL. >>>
When to Avoid Using SELECT * in SQL Queries?
SELECT * returns all the columns, but in some cases, we should avoid this. Learn when SELECT * should not be used. >>>
Moving Data Between Tables in SQL
Learn how to move data between tables in SQL. >>>
Simple University Schema
The basic schema used for examples on Baeldung. >>>
How to Restrict Results to Top N Rows per Group in SQL
By utilizing window functions like ROW_NUMBER(), RANK(), or DENSE_RANK() along with CTE or subqueries, we can partition and rank our data >>>
DELETE With a SELECT Statement in the WHERE Clause
Explore how to use the DELETE statement in combination with a SELECT query in the WHERE clause. >>>
How to Select a Date Without Including the Time in SQL
Learn how to select a Date without the Time in SQL. >>>
Different Types of Keys in SQL
Effective key management is fundamental to maintaining a well-structured and efficient SQL database. Explore the types of keys you can use. >>>
How to Check if a Record Exists in SQL
Explore different methods for checking the existence of a record in an SQL table. >>>