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A sql eBooks created from contributions of Stack Overflow users.
- SQL
Many SQL databases are implemented as client/server systems;...
- Cascading Delete
Cascading Delete - Learning SQL eBook (PDF) -...
- CREATE Database
CREATE Database - Learning SQL eBook (PDF) - riptutorial.com
- Stored Procedures
Stored Procedures are SQL statements stored in the database...
- DROP or DELETE Database
DROP or DELETE Database - Learning SQL eBook (PDF) -...
- In Clause
In Clause - Learning SQL eBook (PDF) - riptutorial.com
- Triggers
Triggers - Learning SQL eBook (PDF) - riptutorial.com
- CASE
Learn SQL - The CASE expression is used to implement if-then...
- SQL
The SQL CREATE FUNCTION statement is used to define a new user-defined function (UDF) in a database. A function in SQL is a set of SQL statements that perform a specific task and return a single value.
User-defined functions (UDFs) allow you to extend SQL by creating custom functions. UDFs encapsulate specific logic and can be used within SQL statements just like built-in functions. They provide a way to modularize complex calculations or data transformations, improving code readability and reusability.
Example: SELECT type, SUM(price) FROM store GROUP BY type; TYPE PRICE LOW 200 MEDIUM 1000 HIGH 900 Having Having Syntax: SELECT column_name(s), aggregate_function(column_name) FROM my_table WHERE condition {optional} GROUP BY column_name(s) HAVING (aggregate_function condition)
Our SQL tutorial will teach you how to use SQL in: MySQL, SQL Server, MS Access, Oracle, Sybase, Informix, Postgres, and other database systems. Start learning SQL now » Examples in Each Chapter
6 paź 2009 · This is a tutorial of the Structured Query Language (also known as SQL) and is a pioneering effort on the World Wide Web, as this is the first comprehensive SQL tutorial available on the Internet. SQL allows users to access data in relational database management systems, such as Oracle, Sybase, Informix, Microsoft SQL
Advanced SQL String and Date/Time Functions String Operations • SQL-92 defines string functions. Many DBMSs also have their own unique functions • These functions can be used in any expression (projection, predicates, e.t.c.) SELECTSUBSTRING(name,0,5)ASabbrv_name FROMstudentsWHEREsid=1 SELECT*FROMstudentsASs WHEREUPPER(e.name)LIKE 'M%'
