The example provided above proves that the MySQLWHEREclause brings data that matches the condition. In this case, it filtered all those employees having the specified job title. However, we often need to set several criteria to retrieve the data. It is feasible – we need to apply the MySQL...
This MySQL tutorial explains how to use the MySQL WHERE clause with syntax and examples. The MySQL WHERE clause is used to filter the results from a SELECT, INSERT, UPDATE, or DELETE statement.
In this guide, we'll take a deep dive into theWHEREclause in MySQL. We'll start with the basic syntax, explore the different operators you can use, and then move on to some practical examples to show you how it all works. And to top it all off, we'll give you some best practices...
ThisSQL tutorialprovides an introduction to theWHERE clausein MySQL, and provides explanations, examples and exercises. For this lesson’s exercises, use this link. This tutorial is a part of several posts describing how to use the WHERE clause in MySQL. To read additional posts regarding this ...
Here are some examples: 1. INSERT It inserts or adds new rows or records in the existing table. Syntax: Insertintovalues(<value1>,<value2>,<value3>…….,<valuen>); Where, table name:The name of the table In which the data needs to be inserted. values:values ...
ref can be used for indexed columns that are compared using the = or <=> operator. In the following examples, MySQL can use a ref join to process ref_table: SELECT*FROMref_tableWHEREkey_column=expr;SELECT*FROMref_table,other_tableWHEREref_table.key_column=other_table.column;SELECT*FROMref...
SELECT*FROMt1WHEREkey_part1=constant1ANDkey_part2>constant2ORDERBYkey_part2; In some cases, MySQLcannotuse indexes to resolve theORDER BY, although it may still use indexes to find the rows that match theWHEREclause. Examples: Availability of an index for sorting may be affected by the use...
Here are some examples of queries with range conditions in theWHEREclause: SELECT*FROMt1WHEREkey_col>1ANDkey_col<10;SELECT*FROMt1WHEREkey_col=1ORkey_colIN(15,18,20);SELECT*FROMt1WHEREkey_colLIKE'ab%'ORkey_colBETWEEN'bar'AND'foo'; ...
MySQL DROP TABLE Examples There are several ways to delete a table in MySQL. The following text elaborates on them. DROP a Table To permanently remove a table, enter the following statement within the MySQL shell: DROP TABLE table1;
In the following examples, queries shows differentr result according to above conditions : departments table: employees table: mysql> SELECT first_name FROM employees WHERE ROW(department_id, manager_id) = (SELECT department_id, manager_id FROM departments WHERE location_id = 1800); ...