What is clause in SQL with example?

Clauses are in-built functions available to us in SQL. With the help of clauses, we can deal with data easily stored in the table. When we have large amounts of data stored in the database, we use Clauses to query and get data required by the user. Some of the examples of clauses are – where, and, or, like, top, etc.

What is clause and its types in SQL?

SQL being a query language requires a method to apply constraints on the data and for this we use Clauses. We have a large variety in the SQL clauses like the Where clause, Union Clase, Order By clause etc. Clauses help us to restrict and manage the data using valid constraints on the data in our database.

What are the six clauses in SQL?

There are presently six clauses that you can utilize in an SQL statement. These six clauses in no particular order are SELECT, FROM, WHERE, GROUP BY, HAVING, and ORDER BY.

WHY DO WE USE WITH clause in SQL?

The SQL WITH clause allows you to give a sub-query block a name (a process also called sub-query refactoring), which can be referenced in several places within the main SQL query. The SQL WITH clause was introduced by Oracle in the Oracle 9i release 2 database.

Is select a clause in SQL?

A SELECT statement retrieves zero or more rows from one or more database tables or database views. In most applications, SELECT is the most commonly used data manipulation language (DML) command. SELECT clause is the list of columns or SQL expressions that must be returned by the query.

What is the SQL where clause?

A WHERE clause in SQL specifies that a SQL Data Manipulation Language (DML) statement should only affect rows that meet specified criteria. In brief SQL WHERE clause is used to extract only those results from a SQL statement, such as: SELECT, INSERT, UPDATE, or DELETE statement.

What are the 2 required clauses in SQL?

SQL clauses

• CONSTRAINT clause.
• FOR UPDATE clause.
• FROM clause.
• GROUP BY clause.
• HAVING clause.
• ORDER BY clause.
• The result offset and fetch first clauses.
• USING clause.

What does with clause mean?

The SQL WITH clause allows you to give a sub-query block a name (a process also called sub-query refactoring), which can be referenced in several places within the main SQL query. WITH clause is not supported by all database system.

What is WHERE clause in SQL?

A WHERE clause in SQL specifies that a SQL Data Manipulation Language (DML) statement should only affect rows that meet specified criteria. In brief SQL WHERE clause is used to extract only those results from a SQL statement, such as: SELECT , INSERT , UPDATE , or DELETE statement.