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SQL Programming > Learn SQL Programming > How clean is my (SQL Server) query? Can it be less...
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How clean is my (SQL Server) query? Can it be less in lines?

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To assess and clean your SQL Server query for efficiency and brevity, consider the following tips: 1. **Use Common Table Expressions (CTEs)**: Instead of multiple subqueries, use CTEs to improve readability. 2. **Eliminate Unnecessary Columns**: Select only the columns you need rather than using...
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To assess and clean your SQL Server query for efficiency and brevity, consider the following tips: 1. **Use Common Table Expressions (CTEs)**: Instead of multiple subqueries, use CTEs to improve readability. 2. **Eliminate Unnecessary Columns**: Select only the columns you need rather than using `SELECT *`. 3. **Combine Queries**: If you have multiple queries doing similar tasks, consider combining them using `UNION` or other set operations. 4. **Use Aliases**: Shorten table names with aliases for easier reading. 5. **Avoid Redundant Conditions**: Review your `WHERE` clause for any redundant conditions. 6. **Utilize Built-in Functions**: Use SQL Server's built-in functions to reduce the number of lines. 7. **Refactor Complex Joins**: Simplify joins if possible, using clearer logic or CTEs. ### Example: Here’s a simplified before-and-after example: **Before**: ```sql SELECT first_name, last_name FROM employees WHERE department = 'Sales' AND status = 'active' ORDER BY last_name; ``` **After**: ```sql SELECT first_name, last_name FROM employees WHERE department = 'Sales' AND status = 'active' ORDER BY last_name; ``` If you share your specific query, I can provide more targeted advice on reducing its length and improving its cleanliness. read less
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To determine how clean your SQL Server query is and whether it can be made more concise, review it for unnecessary complexity, repetitive code, and formatting issues. You can often simplify queries by using common table expressions (CTEs), subqueries, or joining tables more efficiently. Consider using...
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To determine how clean your SQL Server query is and whether it can be made more concise, review it for unnecessary complexity, repetitive code, and formatting issues. You can often simplify queries by using common table expressions (CTEs), subqueries, or joining tables more efficiently. Consider using tools like SQL formatting websites to help optimize and reduce line count.

 

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