How to Use ‘ ALTER statement’ in SQL?

The SQL ALTER statement is used to modify the structure of an existing database object, such as a table, index, or view. Here are a few examples of using the ALTER statement to modify different objects in SQL: ALTER TABLE table_name ADD COLUMN column_name data_type; Here is an example of adding a column named department […]

How to Use CREATE statement in SQL?

The SQL CREATE statement is used to create various database objects, such as tables, indexes, views, and more. Here are a few examples of using the CREATE statement to create different objects in SQL: Here is an example of creating a table named employees with three columns: id, name, and salary. Here is an example […]

How to use TRUNCATE statement in SQL?

The SQL TRUNCATE statement is used to remove all data from a table, but unlike the DROP statement, it does not delete the table structure or any associated indexes, constraints, triggers, or permissions. The TRUNCATE statement is faster than the DELETE statement for removing all data from a table, as it operates at the data […]

Learn How to use DROP statement in SQL?

The SQL DROP statement is used to delete an existing database object, such as a table, index, or view. The DROP statement is an irreversible operation, so it is important to be careful when using it, as all data in the object being dropped will be permanently deleted. Here are a few examples of using […]

How to use “Aggregate Functions” in SQL?

SQL provides several aggregate functions that allow you to perform calculations on a set of values. Some of the most commonly used aggregate functions are: COUNT(*) Here is an example: The result of this query will be the number of rows in the employees table. SUM(column name) Here is an example: The result of this […]

How to Use “Conversion Functions” in SQL?

SQL provides several functions for converting data from one data type to another. These functions are known as conversion functions. Some of the most commonly used conversion functions in SQL are: CAST(expression AS data type) Here is an example: The result of this query will be ’10’. CONVERT(data type, expression [, style]) Here is an […]

How to use Numeric Functions in SQL?

SQL provides several functions for working with numeric data. These numeric functions can be used to perform operations such as rounding numbers, finding the minimum or maximum value, and more. Here are some of the most commonly used numeric functions in SQL: Here is an example: The result of this query will be 3.14. Here […]

How to Use ‘Date and Time Functions’ in SQL?

SQL provides several functions for working with dates and time functions. These functions can be used to perform operations such as formatting dates, extracting parts of a date, calculating differences between dates, and more. Here are some of the most commonly used date and time functions in SQL: The first query will return the current […]

How to Use ‘String Functions’ in SQL?

SQL provides several string functions that can be used to manipulate and perform operations on string data. Here are some of the most commonly used string functions in SQL: The result of this query will be 11, which is the number of characters in the string ‘Hello World’. The first query will return ‘HELLO WORLD’ […]

How to use CONCAT function in SQL?

In SQL, the CONCAT function is used to concatenate (combine) two or more strings into a single string. The syntax for the CONCAT function is: Where string1, string2, …, string_n are the strings that you want to concatenate. The function returns the concatenated string. Here is an example using the CONCAT function: Consider a customers […]