What does follow after the SQL WHERE clause? The name of the table we are selecting from. Definition of the condition to be met for the rows to be returned. A list of columns to be selected.
What is the order of clauses in SQL?
Use the ORDER BY clause to display the output table of a query in either ascending or descending alphabetical order. Whereas the GROUP BY clause gathers rows into groups and sorts the groups into alphabetical order, ORDER BY sorts individual rows. The ORDER BY clause must be the last clause that you specify in a query.
What does the SQL WHERE clause do?
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 is the order of execution of SQL query?
Query order of execution
- FROM and JOIN s. The FROM clause, and subsequent JOIN s are first executed to determine the total working set of data that is being queried. …
- WHERE. …
- GROUP BY. …
- HAVING. …
- SELECT. …
- DISTINCT. …
- ORDER BY. …
- LIMIT / OFFSET.
What is the correct order of different clauses?
Syntax: The basic syntax of ORDER BY clause is as follows: SELECT column-list FROM table_name [WHERE condition] [ORDER BY column1, column2, .. columnN] [ASC | DESC];
Which of the following is correct order of clauses for an SQL query?
37) Which of the following is the correct order of a SQL statement? Explanation: In SQL statements, the WHERE clause always comes before GROUP BY, and the HAVING clause always comes after GROUP BY. Therefore, option B is the correct choice.
What is the difference between WHERE and HAVING clauses?
1. WHERE Clause is used to filter the records from the table based on the specified condition. HAVING Clause is used to filter record from the groups based on the specified condition.
Can we use WHERE and HAVING in same query?
A query can contain both a WHERE clause and a HAVING clause. … Only the rows that meet the conditions in the WHERE clause are grouped. The HAVING clause is then applied to the rows in the result set.
What’s difference between truncate and delete?
The DELETE statement removes rows one at a time and records an entry in the transaction log for each deleted row. TRUNCATE TABLE removes the data by deallocating the data pages used to store the table data and records only the page deallocations in the transaction log.