sql query for getting data for last 3 months

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Okay, let's dive into retrieving data for the last three months using SQL queries. This is a very common requirement in reporting, data analysis, and many other database-driven applications. We'll cover several approaches, including considerations for different database systems and timezones.

**Understanding the Core Problem**

The fundamental problem is to filter your data based on a date column within your table, selecting only those rows where the date falls within the period of the last three months, *relative to today*.

**General Approach & Key Concepts**

1. **Date Column:** You need a column in your table that stores date or datetime values. Let's assume this column is named `order_date`, `created_at`, `transaction_date`, or something similar, representing the date of the event you're interested in. Adapt the examples below to your actual column name.

2. **"Today":** You need a way to get the current date. SQL databases have built-in functions for this.

3. **Date Arithmetic:** You need to subtract three months from the current date. SQL databases also provide functions for date arithmetic.

4. **Filtering:** You'll use the `WHERE` clause to filter your table, ensuring that the date column's value is within the desired range.

**Database-Specific Implementations**

The specific SQL syntax for getting the current date and performing date arithmetic varies between database systems. Let's look at examples for the most common ones:

**1. MySQL/MariaDB**
* **`CURDATE()`:** Returns the current date (without the time component).
* **`DATE_SUB(date, INTERVAL expr unit)`:** Subtracts a time interval from a date. `expr` is the amount, and `unit` specifies the time unit (e.g., `MONTH`, `DAY`, `YEAR`).
* **`your_table`:** Replace this with the actual name of your table.
* **`order_date`:** Replace this with the name of your date column.
* **`=`:** This is crucial. It includes records from the beginning of the day that is exactly three months ...

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