How to Dynamically Specify Table Names in SQL Statements?

Utilizing Dynamic Table Names in SQL Statements

When constructing complex queries, it often becomes necessary to dynamically specify table names. However, using raw text concatenation can lead to syntax errors and vulnerabilities. This article examines an alternative approach using prepared statements, along with providing a step-by-step solution to the specific error you encountered.

Error Encountered

The error [Err] 1064 - You have an error in your SQL syntax... occurs because MySQL cannot directly evaluate table names constructed using raw text concatenation.

The Solution: Prepared Statements

Prepared statements allow you to build and execute queries dynamically while ensuring SQL syntax remains valid. Here's how to use them to resolve your error:

1. Define dynamic table name:

   SET @id := '47';
   SET @table := concat(@id, '_2013_2014_voucher');

2. Construct query string:

   SET @qry1 := concat('select * from ', @table);

3. Prepare statement:

   prepare stmt from @qry1;

4. Execute statement:

   execute stmt;

5. Repeat for delete query:

   SET @qry2 := concat('DELETE FROM ', @table, ' WHERE>

By utilizing prepared statements, you can effectively handle dynamic table names and eliminate syntax errors associated with raw text concatenation. This approach adheres to database best practices and enhances code security.

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