## mysql-where

# MySQL WHERE clause

The `WHERE`

clause in MySQL is used to filter records in a query result set. It specifies a condition that must be satisfied in order for a row to be returned in the result set. The `WHERE`

clause is used in various SQL statements such as `SELECT`

, `UPDATE`

, and `DELETE`

.

Here’s a basic syntax of the `WHERE`

clause in a `SELECT`

statement:

The MYSQL where clause is the mechanism for selecting the row you want for your result set.

```
SELECT column1, column2, ...
FROM table_name
WHERE condition;
```

The `condition`

in the `WHERE`

clause is a logical expression that evaluates to either `TRUE`

or `FALSE`

. If the condition evaluates to `TRUE`

, the row is returned in the result set. If the condition evaluates to `FALSE`

, the row is not returned in the result set.

Here’s an example that uses the `WHERE`

clause to select all rows from the `customers`

table where the `country`

is ‘USA’:

```
SELECT *
FROM customers
WHERE country = 'USA';
```

In Select query expressions in WHERE clauses can use the following type of operation:

Arithmetic for calculation

Comparison for comparison of one expression with another expression.

Logical to combine different WHERE conditions.

Parameter For MySQL WHERE clause

## Arithmetic Operation used in Mysql Where Clause

Operation | Definition |
---|---|

+ | Addition |

– | Subtraction |

* | Multiplication |

/ | Division |

div | Interger Division |

% | Modulo |

## Comparison Operator for MYSQL where Clause

Operation | Defination |
---|---|

< | Less then |

>= | Less then or equal to |

= | Equal to |

<=> | Equal (work even for NULL values) |

<> or != | Not equal to |

>= | Greater than or equal to |

> | Greater than or equal to |

Between … and. . | Indicate a range of values |

## Logical Operator For where Clause

Operation | Definition |
---|---|

AND | Logical AND |

OR | Logical OR |

XOR | Logical exclusive OR |

NOT | Logical negation |