Since vs. Where

Attribute	Since	Where
Usage	Used to indicate a point in time or starting point	Used to indicate a condition or location
Function	Denotes a specific time or event	Denotes a place or situation
Examples	Since yesterday, Since 2010	Where are you?, Where is the nearest gas station?

Introduction

When it comes to writing SQL queries, two commonly used keywords areSINCE andWHERE. While both serve similar purposes in filtering data, there are key differences between the two that can impact the results of a query. In this article, we will explore the attributes of SINCE and WHERE, highlighting their similarities and differences to help you understand when to use each one.

Definition

SINCE is a keyword used in SQL queries to specify a starting point in time or a condition that must be met. It is often used in conjunction with date or time values to filter data based on when a certain event occurred. On the other hand,WHERE is a keyword that is used to filter rows based on a specified condition. It is commonly used to restrict the results of a query to only those rows that meet the specified criteria.

Usage

One key difference between SINCE and WHERE is their usage in SQL queries. SINCE is typically used when filtering data based on a specific time frame or date range. For example, you might use SINCE to retrieve all records that have been created since a certain date. On the other hand, WHERE is used to filter data based on a specific condition, such as retrieving all records where the sales amount is greater than a certain value.

Functionality

While SINCE and WHERE both serve to filter data in SQL queries, they do so in slightly different ways. SINCE is often used with date or time values to specify a starting point, while WHERE is used to filter rows based on a condition. This means that SINCE is more commonly used when dealing with temporal data, such as filtering records based on when they were created or updated. WHERE, on the other hand, is used to filter data based on any type of condition, not just temporal ones.

Examples

Let's look at some examples to better understand how SINCE and WHERE are used in SQL queries. Suppose we have a table calledorders with columns fororder_id,order_date, andtotal_amount. If we wanted to retrieve all orders that were placed since January 1, 2021, we would use SINCE in our query like this:

SELECT * FROM ordersWHERE order_date >= '2021-01-01';

On the other hand, if we wanted to retrieve all orders where the total amount is greater than $100, we would use WHERE in our query like this:

SELECT * FROM ordersWHERE total_amount > 100;

Conclusion

In conclusion, SINCE and WHERE are both important keywords in SQL queries that serve to filter data based on specific criteria. While SINCE is typically used with date or time values to specify a starting point, WHERE is used to filter rows based on a condition. Understanding the differences between SINCE and WHERE can help you write more efficient and effective SQL queries that retrieve the data you need. By considering the attributes of SINCE and WHERE, you can choose the right keyword for your specific filtering needs.