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- For example, we want to get the first three letters in a string and convert them to uppercase. To do this, it will be enough for us to combine two functions: LEFT and UPPER, where the result of one function will be an argument for the second.
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May 24, 2022 · Take Advantage of COALESCE () To Process NULLs. In this article, we demonstrated several ways to use the SQL COALESCE () function. We covered how to use COALESCE () to replace NULL values, how to compute an alternative value, and how to combine COALESCE () with the ROLLUP clause, among other examples.
- 20 Basic SQL Query Examples for Beginners | LearnSQL.com
It has 129 interactive exercises on querying one or more...
- 20 Basic SQL Query Examples for Beginners | LearnSQL.com
- Selecting All Columns From One Table. This query is useful when you want to quickly get all the columns from a table without writing every column in the SELECT statement.
- Selecting One Column From One Table. You can use this query when you only need one column from the table.. Query. SELECT first_name FROM employees; Explanation.
- Selecting Two Columns From One Table. This query is useful when selecting two (or more) columns from one table. Query. SELECT first_name, last_name FROM employees;
- Selecting Two (or More) Columns From One Table and Filtering Using Numeric Comparison in WHERE. Knowing this SQL query will allow you to filter data according to numeric values.
- 27 Understanding Relational Databases.
- 27 Why You Should Learn SQL.
- 27 Understanding SQL Constraints.
- 27 How To Create and Manage Tables in SQL.
- Overview of SQL Functions
- SQL Built-In Functions
- Aggregate Functions
- SQL Avg() Function with Example
- SQL Count() Function with Example
- SQL Count_Big() Function with Example
- SQL Max() Function with Example
- SQL Min() Function with Example
- SQL Stdev() Function with Example
SQL provides much in-build function to perform operation of table data, these functions can be with-in SQL statements or queries, and can also be used within the programming environment provided by the SQL Server (Transact-SQL) database, such as stored procedures, functions, triggers, etc. SQL Built-In functions are generally used to perform string...
SQL provides many built-in functions for performing processing on string or numeric data, the following are the list of categories of Built-In functions based on the type of data used in operation 1. Aggregate Functions 2. Scalar functions
Aggregate functions operates on set of numeric values and return a single value, SQL Aggregate function are used as the select list of SQL SELECT statement and also can be used in combination with the GROUP BY clauseto calculate the aggregation on categories of rows
SQL AVG() function is used to calculate the average value of given numeric values Example 1: Write SQL query to calculate average obtain marks of each semester student 1. In the above query, SQL AVG() function is applied on obtain marks column of result table to calculate average value of obtain mark values 2. SQL Group By clause is used make group...
SQL COUNT() function is used to count the total number of records which matches with given condition Example 3: Write SQL query to count total number of students citywise 1. In the above query, SQL COUNT() Aggregate function is used to count total number of students lived in each city 2. SQL Group By clause is used to make a group of records based ...
The COUNT_BIG() function is used to count the number of records including records with NULL values Example 4 : Write SQL query to count total number of records in result table In the above query, SQL COUNT_BIG() function is used to count total records in result table OUTPUT:
SQL MAX() function is used to find Maximum value from the list of values Example 7: Write SQL query to find maximum value of obtain mark for sem3 students 1. In the above query, SQL MAX () function is applied on obtain mark column to find maximum mark from all students 2. SQL Where clause is used to conditionally retrieve records of sem3 students O...
SQL MIN() function is used to find Minimum value from the list of values Example 8: Write SQL query to find minimum value of obtain mark for sem3 students 1. In the above query, SQL MIN () function is applied on obtain mark column to find minimum mark from all students 2. SQL Where clause is used to conditionally retrieve records of sem3 students O...
SQL STDEV() function is used to calculate the Standard Deviation of total records retrieved by the SQL SELECT Statement Example 9: Write SQL query to calculate standard deviation of obtain marks of semester 3 students In the above query, SQL STDEV() function is applied on obtainmarks column to calculate standard deviation of obtain marks value of s...
Feb 15, 2023 · Understanding how to use functions can greatly enhance the functionality of SQL queries and help to make data analysis more efficient and accurate. SQL functions are a fundamental aspect of SQL and are a must-have tool for anyone working with SQL databases.
- Max Reynolds
- Phd Candidate
This section provides you with many built-in SQL functions including aggregate functions, date functions, string functions, control flow functions, window functions, and math functions.
Nov 21, 2023 · Real-world Examples of Using SQL Aggregate Functions. 1. Grouping by Product Categories for Sales Insights. 2. Analyzing Sales by Product Category and Year. 3. Filtering Product Categories with High Sales. 4. Counting Unique Customers. 5. Distinguishing COUNT () Functions for Accurate Reporting. 6.
