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Converts a value (of any type) into a specified datatype. CURRENT_USER. Returns the name of the current user in the SQL Server database. IIF. Returns a value if a condition is TRUE, or another value if a condition is FALSE. ISNULL. Return a specified value if the expression is NULL, otherwise return the expression.
- Aggregate Functions
- Date Functions
- String Functions
- Math Functions
- Ranking Functions
- Analytical Functions
- Window Functions
Aggregate functionsare used to perform calculations on a set of values and return a single value as the result. The most commonly used aggregate functions in SQL are:
Date functionsare used to manipulate and format dates and times in SQL. Some commonly used date functions include:
String functionsare used to manipulate text data in SQL. Some commonly used string functions include:
Math functionsare used to perform mathematical operations on numerical data in SQL. Some commonly used math functions include:
Ranking functionsare used to assign a rank to each row in a result set based on the values in a specific column or set of columns. Ranking functions are particularly useful in situations where you need to determine the top or bottom N rows based on a certain criteria, or to calculate percentiles for a set of values.
Analytical functionsare used to perform complex calculations and analysis on a result set, without grouping the data. Analytical functions can be used to calculate running totals, moving averages, and other aggregate values over a specific window or group of rows.
Window functionsoperate on a specific subset of rows in a result set and return a value for each row, based on calculations performed over a window or group of rows. Window functions are used to perform complex analysis on the data and return aggregate or summary information without grouping the data. They provide a flexible way of calculating aggr...
Feb 25, 2020 · Note: You’ll call a function by simply using its name and providing the parameters needed. If the function is value-based, then you’ll be able to use this function at any place where you would use a number, string, etc. Now, we’ll use this function in the more complex query:
The SQL Server user-defined functions help you simplify your development by encapsulating complex business logic and make them available for reuse in every query. User-defined scalar functions – cover the user-defined scalar functions that allow you to encapsulate complex formula or business logic and reuse them in every query. Table ...
6 days ago · PL/SQL functions are reusable blocks of code that can be used to perform specific tasks. They are similar to procedures but must always return a value. A function in PL/SQL contains:Function Header: The function header includes the function name and an optional parameter list. It is the first part of the function and specifies the name and paramete
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Nov 1, 2019 · SQL Server Scalar-Valued User Defined Function (UDF) Example. Before you can use a udf , you must initially define it. The create function statement lets you create a udf. For example, you can code a SQL expression to compute a scalar value inside the create function statement. When some code invokes the function, the computed value is the ...
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. Functions help in encapsulating a set of logic that can be reused in various parts of SQL queries, enhancing code modularity and maintainability.
