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The SQL Group By statement is used to organize similar data into groups. The data is further organized using an equivalent function. It means that if multiple rows in a specific column have the same values, they will be grouped. The SELECT statement is combined with the GROUP BY clause in a SQL query: The […]
March 28, 2023 | DBMS | No comments
What is the ORDER BY Clause? In the SELECT query, the ORDER BY clause can be used to sort the result in ascending or descending order of one or more columns. ORDER BY by default sorts the data in ascending order. We can sort the data in descending order with the keyword DESC and ascending […]
March 26, 2023 | DBMS | No comments
In SQL to filter data based on a specific pattern, the LIKE clause is used in the WHERE condition. It can be applied to date, string, or numeric values. However, using the string values is advised. Uses of LIKE clause in SQL: The following are some examples of how the LIKE clause is used: Enables […]
March 25, 2023 | DBMS | No comments
When retrieving data from a single table or by joining data from multiple tables, a condition is specified using the SQL WHERE clause. If the given condition is satisfied, then only it returns a specific value from the table. The WHERE clause should be used to filter the records and only retrieve those that are […]
March 24, 2023 | DBMS | No comments
What is DCL? Data Control Language is known as DCL in SQL. By creating users and granting or removing privileges from users, DCL commands are used to regulate and manage access to the database. There are two main DCL commands in SQL: GRANT REVOKE. GRANT Query: SQL GRANT command is used to grant specific privileges […]
March 23, 2023 | DBMS | No comments
What is TCL? Transactional control commands(TCL) can only be used with DML commands like INSERT, UPDATE, and DELETE. They cannot be used when creating or deleting tables because the database automatically commits these operations. NOTE: Before proceeding with TCL commands, you must know about the DML & DDL commands. COMMIT command: The Commit command is used […]
March 22, 2023 | DBMS | No comments
What is Delete Query? In SQL, the DELETE Query removes existing records from a table. Depending on the condition specified in the WHERE clause, we can delete a single record or multiple records. NOTE: This command must be used with extreme caution because it permanently deletes the data. Syntax: where table_name is the table that has […]
March 22, 2023 | DBMS | No comments
What is an UPDATE QUERY? The SQL UPDATE statement is used to modify the data in tables’ records. A condition determines which rows are to be updated. The WHERE clause is used to specify conditions. Syntax: where, table_name: name of the table column_name: name of first, second, third column… expression: new value for first, second, […]
March 17, 2023 | DBMS | No comments
Insert is a commonly used command in the Structured Query Language (SQL) data manipulation language (DML) used by SQL Server and Oracle relational databases. The insert command inserts one or more rows into a database table with the specified table column values. The insert statement is the first DML command executed immediately after creating a […]
March 16, 2023 | DBMS | No comments
The various DDL commands that are used to redefine the tables will be covered in this tutorial. Truncate Query: TRUNCATE statement is a Data Definition Language (DDL) operation that is used to mark the extent of a table for deallocation (empty for reuse). This method instantly deletes all of the data from a table while […]
March 15, 2023 | DBMS | No comments