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Tutorials

Adding Column in SQL: Complete Guide to ALTER TABLE ADD COLUMN

Learn how to add a column in SQL using ALTER TABLE. Complete guide with examples for MySQL, PostgreSQL, SQL Server, and Oracle, including constraints and best practices.

Sarah Johnson•7 min read
#SQL#Database#Tutorials
Tutorials

SQL WHERE IS NOT NULL: Complete Guide to Filtering NULL Values

Learn how to use SQL WHERE IS NOT NULL to filter out NULL values. Complete guide with examples, best practices, and common use cases.

Sarah Johnson•7 min read
#SQL#Database#Tutorials
Tutorials

SQL Query Descending Order: Complete Guide to ORDER BY DESC

Learn how to use SQL query descending order with ORDER BY DESC. Complete guide with examples, multiple columns, NULL handling, and best practices.

Sarah Johnson•6 min read
#SQL#Database#Tutorials
Tutorials

What Uniquely Identifies Each Row in a Table: Understanding Primary Keys and Unique Identifiers

Learn what uniquely identifies each row in a table, including primary keys, unique constraints, and composite keys in database design.

Sarah Johnson•6 min read
#SQL#Database#Primary Key
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