The SQL LIKE operator is used in a WHERE clause to search for a specific pattern in a column. The LIKE operator is often used with the % wildcard, which can match any number of characters, including none. The syntax for the LIKE operator is as follows: SELECT column1, column2, … FROM table_name WHERE column_name […]
SQL provides several aggregate functions that allow you to perform calculations on a set of records. The COUNT(), AVG(), and SUM() functions are some of the most commonly used aggregate functions in SQL. SQL COUNT() Function The COUNT() function is used to count the number of rows in a table. The syntax of the COUNT() […]
The SQL MIN and MAX functions are used to find the minimum and maximum values in a column of a table, respectively. These functions are frequently used in SQL queries to retrieve the smallest or largest value from a set of records. SQL MIN Function The MIN function is used to find the smallest value […]
The SQL TOP, LIMIT, FETCH FIRST, and ROWNUM clauses are used to limit the number of rows returned by a query. These clauses are used to limit the results of a query to a specified number of rows, making it easier to manage and manipulate the returned data. The syntax of each clause may vary […]
The DELETE statement in SQL is used to delete existing records from a table. This statement is used to remove one or more rows from a database table based on certain conditions. Once the data is deleted, it cannot be recovered. Syntax The syntax of the DELETE statement is as follows: DELETE FROM table_name WHERE […]
The SQL UPDATE statement is used to modify the existing data in a table. It allows you to change the values of one or more columns in one or more rows in a table. The basic syntax of the SQL UPDATE statement is: UPDATE table_name SET column1 = value1, column2 = value2, … WHERE some_column […]
SQL NULL values are used to represent missing or unknown data. NULL values are not the same as empty or zero values, and they are also different from values in a database that have not been assigned a value yet. Understanding how to work with NULL values is an important part of using SQL effectively. […]
The SQL INSERT INTO statement is used to insert new records into a database table. The INSERT INTO statement is used to add new rows of data to a table in a database. Syntax The syntax for the SQL INSERT INTO statement is as follows: INSERT INTO table_name (column1, column2, column3, …) VALUES (value1, value2, […]
SQL is a language used to manage and manipulate relational databases. One of the most common operations performed on a database is sorting data. The SQL ORDER BY keyword is used to sort the data in a specific order. The data can be sorted either in ascending or descending order based on one or multiple […]
SQL offers a range of logical operators that allow you to combine multiple conditions in your query statements. These operators are AND, OR, and NOT. In this article, we will discuss each of these operators in detail, including how they work and how to use them in your SQL statements. Sample Dataset To understand the […]
