Category: SQL

The SQL UPPER function is a string function that is used to convert all the characters of a string expression to uppercase. This function is used to standardize text data in a database, making it easier to search and compare information. Syntax The syntax of the SQL UPPER function is as follows: UPPER(string_expression) Where string_expression…(Continue Reading)

SQL REPLACE function is a string function used to replace all occurrences of a substring within a given string with another substring. The syntax for the REPLACE function in SQL is as follows: REPLACE(string, old_substring, new_substring) where string is the original string, old_substring is the substring to be replaced, and new_substring is the replacement substring.…(Continue Reading)

The SQL LEN function is a built-in function that is used to return the length of a given string or expression in characters. The LEN function is commonly used in SQL queries to perform various operations on character data. For example, it can be used to validate the length of input data to ensure that…(Continue Reading)

The SQL SUBSTRING function is used to extract a portion of a string value from a larger string. The syntax for the function is as follows: SUBSTRING(string, start, length) Where string is the input string value, start is the starting position from which the substring is to be extracted, and length is the number of…(Continue Reading)

SQL CONCAT function is a built-in string function that is used to concatenate two or more strings together. The CONCAT function is available in most of the popular database management systems such as MySQL, Oracle, PostgreSQL, SQL Server, and others. Syntax The syntax of the CONCAT function is straightforward. It takes two or more string…(Continue Reading)

SQL String functions are a set of built-in functions that are used to manipulate strings or character data in SQL. These functions can be used to extract, transform and manipulate data stored in character data type columns. Here are some of the most commonly used SQL string functions: CONCAT This function is used to concatenate…(Continue Reading)

SQL aggregate functions are used to perform calculations on groups of rows or on an entire table in a database. These functions allow you to calculate the minimum, maximum, average, sum, and count of values in a column or a set of columns in a table. The most commonly used SQL aggregate functions are: SUM…(Continue Reading)

In SQL, the ADD COLUMN statement is used to add a new column to an existing table. This statement modifies the structure of the table and can be used to add a new column that contains a specific data type and constraints. Syntax The basic syntax for the ADD COLUMN statement is as follows: ALTER…(Continue Reading)

The SQL SUM function is a built-in aggregate function in Structured Query Language (SQL) that is used to calculate the sum of a set of values in a specified column of a table. It is a powerful tool that allows you to easily compute the total of numeric data within a dataset. The SUM function…(Continue Reading)

The SQL MIN function is used to retrieve the smallest value from a column in a database table. It is a built-in function in Structured Query Language (SQL) that can be used in SELECT statements to return the minimum value of a specified column. Syntax The syntax of the MIN function is as follows: SELECT…(Continue Reading)