SQL ADD CONSTRAINT Keyword The ADD CONSTRAINT command is used to add a constraint to an existing table after it […]

SQL ADD Keyword The ADD keyword in SQL is used with the ALTER TABLE statement to add a new column

This lesson lists and explains all standard SQL keywords, including those not supported in our playground environment. Unsupported features are

SQL data types define the kind of value a column can hold. Choosing the correct data type is essential for

SQL Hosting refers to the service of hosting a web-accessible SQL database on a server, so your website or app

SQL Injection is a malicious technique where attackers insert or “inject” SQL code into queries through user input, potentially gaining

SQL views are virtual tables based on the result of an SQL query. They do not store data physically but

SQL Dates is a feature in SQL that allows you to store, filter, and manipulate date and time values in

Auto-increment allows a unique number to be generated automatically when a new record is inserted. This is commonly used for

Indexes are used in SQL to speed up searches in tables. When you create an index on a column, the