SQL Wildcard Characters with examples
SQL Wildcard Characters with examples In SQL, wildcard characters are used in conjunction with the LIKE operator to match patterns in character strings. There are two wildcard characters commonly used in SQL: % and _. % – The percent sign represents zero, one, or multiple characters. It can be used to match any number of […]
SQL LIKE Operator
SQL LIKE Operator The LIKE operator in SQL is used to match patterns in character strings. It is used in the WHERE clause of a SELECT statement to filter the results based on a specified pattern. The LIKE operator is typically used with the percent sign (%) and the underscore (_) as wildcard characters. The […]
SQL COUNT(), AVG() and SUM() Functions
SQL COUNT(), AVG() and SUM() Functions In SQL, the COUNT(), AVG(), and SUM() functions are used to perform aggregate calculations on a set of values in a table. The COUNT() function returns the number of rows that match a specified condition. The AVG() function returns the average (mean) of the values in a specified column. […]
SQL MIN() and MAX() Functions
SQL MIN() and MAX() Functions In SQL, the MIN() and MAX() functions are used to retrieve the minimum and maximum values of a column in a table. The MIN() function returns the smallest value of the selected column, while the MAX() function returns the largest value. Here is the basic syntax for using the MIN() […]
Introduction
Introduction C is a general-purpose programming language that was developed in the early 1970s by Dennis Ritchie at Bell Labs. It was designed as a low-level systems programming language that could be used to write operating systems, device drivers, and other software that needed to interact closely with the hardware. C is a compiled language, […]
SQL TOP, LIMIT, FETCH FIRST or ROWNUM Clause
SQL TOP, LIMIT, FETCH FIRST or ROWNUM Clause SQL TOP, LIMIT, FETCH FIRST, and ROWNUM clauses are used to limit the number of rows returned by a query. These clauses are often used when dealing with large tables to improve query performance or to display a subset of data to the user. Here are examples […]
SQL DELETE Statement
SQL DELETE Statement The SQL DELETE statement is used to remove one or more records from a table. The syntax of the DELETE statement is as follows: DELETE FROM table_name WHERE condition; Here, table_name is the name of the table that you want to delete records from. The WHERE clause is used to specify the […]
SQL UPDATE Statement
SQL UPDATE Statement The SQL UPDATE statement is used to modify existing records in a table. The syntax of the UPDATE statement is as follows: UPDATE table_name SET column1 = value1, column2 = value2, … WHERE condition; Here, table_name is the name of the table that you want to update. column1, column2, etc. are the […]
SQL NULL Values
SQL NULL Values In SQL, NULL is a special marker used to indicate that a data value does not exist in the database. NULL is not the same as an empty string (”) or zero (0). It is a value that is unknown, undefined or missing. When a column is created, it may be defined […]
SQL INSERT INTO Statement
SQL INSERT INTO Statement The SQL INSERT INTO statement is used to insert new records into a table. The syntax of the INSERT INTO statement is as follows: INSERT INTO table_name (column1, column2, column3, …) VALUES (value1, value2, value3, …); Here, table_name is the name of the table into which you want to insert data. […]