SQL Server 2008 supports user-defined functions and built-in, system, functions. Scalar Functions User-defined scalar functions return a single data value of the type defined in the RETURNS clause. For an inline scalar function, there is no function body; the scalar value is the result of a...
A clustered index is one of the main index types in SQL Server. A clustered index stores the index key in a B-tree structure along with the actual table data in each leaf node of the index. Having a clustered index defined on a table eliminates the heap table structure we described in ...
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U-SQL language U-SQL language reference Built-in functions Built-in system objects and extensions Control-of-flow language Data definition language (DDL) statements Data modification language (DML) statements Data types and literals Introduction to data types ...
Today, we’ve described 3 types of relations used in the databases. While this is more of a theory, it’s necessary for understanding how everything works. In upcoming articles, especially those focused on how to write (complex) SQL queries, I’ll also, from time to time, mention these...
Some things you should be aware of with respect to BIGINT columns: • All arithmetic is done using signed BIGINT or DOUBLE values, so you should not use unsigned big integers larger than 9223372036854775807 (63 bits) except with bit functions! If you do that, some of the last digits in...
CHAR is shorthand for CHARACTER. NATIONAL CHAR (or its equivalent short form, NCHAR) is the standard SQL way to define that a CHAR column should use some predefined character set. MySQL uses utf8mb3 as this predefined character set.
Transact-SQL derives all system date and time values from the operating system of the computer on which the instance of SQL Server runs. Higher-precision system date and time functions Since SQL Server 2008 (10.0.x), the Database Engine derives the date and time values through use of the ...
Like packaged subprograms, methods of the same kind (functions or procedures) can be overloaded. That is, you can use the same name for different methods if their formal parameters differ in number, order, or datatype family. When you call one of the methods, PL/SQL finds it by comparing...
2.1.2.151 S201-02, Array as result type of functions 2.1.2.152 S202, SQL-invoked routines on multisets 2.1.2.153 S211, User-defined cast functions 2.1.2.154 S231, Structured type locators 2.1.2.155 S232, Array locators 2.1.2.156 S233, Multiset locators 2.1.2.157 S241, Transform f...