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 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 ALTER command is a DDL command that can be used to change the structure of existing tables in the database by adding, modifying, renaming, or removing columns and constraints. Using the ALTER command, you can add columns, rename columns, delete columns, or change the data type of columns. ALTER Command: Syntax Adding a Column: […]
March 14, 2023 | DBMS | No comments
SQL Data Types are an important component of the attributes present in the tables, as well as the queries used to retrieve data from those tables. SQL data types define attributes based on the categories to which they belong. Data types are mainly classified into three categories for every database. String Data types Numeric Data […]
March 12, 2023 | DBMS | No comments