SQL Basics
SQL BETWEEN
Range Filtering with BETWEEN
BETWEEN filters data within inclusive ranges, ideal for numeric or date conditions.
Understanding the SQL BETWEEN Clause
The SQL BETWEEN clause is used to filter the result set within a specific range. This range is inclusive, meaning it includes the boundary values specified. BETWEEN is particularly useful for filtering numeric values, dates, and even text (though less common).
Syntax of SQL BETWEEN
The basic syntax for the SQL BETWEEN operator is as follows:
Using BETWEEN with Numbers
You can use the BETWEEN clause to filter numeric values in a table. For example, suppose you have a table of products with their prices, and you want to find all products within a certain price range.
Using BETWEEN with Dates
The BETWEEN clause is also effective for filtering date ranges. For instance, if you have an orders table and you want to find all orders placed between January 1, 2023, and March 31, 2023, you can use the following query:
Using BETWEEN with Text
Although less common, the BETWEEN clause can be used with text strings. This is based on the alphabetical order. E.g., selecting names between 'A' and 'L':
Inclusive Nature of BETWEEN
It's important to note that the SQL BETWEEN clause includes the values specified as the lower and upper bounds. This means if the boundary values exist in the data, they will be included in the result set.
Common Pitfalls with BETWEEN
A common pitfall when using the BETWEEN clause is not accounting for the inclusive nature of the boundaries. Ensure that the range intended includes correct boundary values, especially when dealing with dates or floating-point numbers.
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