1= 1 SQL Trick

he 1=1 condition in query = "SELECT * FROM main_table WHERE 1=1" is a common SQL trick that simplifies dynamic query construction.

Here’s why it’s used:

1. Easier to Add Filters Dynamically:

• The 1=1 is a "dummy condition" that’s always true, so it doesn’t affect the query result. It’s there to simplify the query construction process when you need to add conditions dynamically.
• When you add conditions like AND profilenumber LIKE %s, you don’t need to check if it’s the first condition. This avoids issues with SQL syntax where the AND or OR keywords need to be properly prefixed.

2. Consistency in Query Construction:

• Without 1=1, you would need to handle each conditional clause differently, e.g., by adding WHERE only before the first condition and AND for any subsequent conditions. Using 1=1 keeps the query code consistent and readable.