![]() ![]() ![]() Once you're familiar with the basics, you'll move on to next level that explains the methods of retrieving records through joining multiple tables, searching records in the table based on pattern, etc.įinally, you'll explore some advanced concepts, such as modifying the existing table structure, performing aggregations and grouping data together, creating views to simplify and secure table access, creating indexes for tables, handling dates and times, cloning of an existing table, creating temporary tables, as well as, concept of SQL subqueries and SQL injection. This SQL tutorial series covers all the fundamental concepts of SQL language, such as creating database and tables, using constraints, adding records to a table, selecting records from a table based on different conditions, updating and deleting records in a table, and so on. Our SQL tutorials will help you understand the core concepts of modern SQL in database systems such as MySQL. For numeric variables, a precision and scale are also assigned. SQL has evolved a lot in the past decade. T-SQL ( Transact SQL) tutorial is designed for both beginners and professionals. Assigning a system-supplied or user-defined data type and a length. The name must have a single as the first character. Note: Most of relational database systems also have their own additional proprietary extensions in addition to the SQL standard that are available only on their system. The DECLARE statement initializes a Transact-SQL variable by: Assigning a name.
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