Why is My MySQL SELECT Command Denied, and How Can I Fix It?

Troubleshooting Denied Select Command in MySQL

In a MySQL website using a Web service for database operations, an error is encountered:

select command denied to user '<userid>'@'<ip-address>' for table '<table-name>'

This error typically occurs at the line where MySqlDataReader.ExecuteReader() is called. Below is the relevant code:

String addSQL = "Select Max(`TradeID`) from `jsontest`.`tbl_Positions";
...
MySqlCommand command1 = objMyCon1.CreateCommand();

command1.CommandText = newSQL;
MySqlDataReader result1 = command1.ExecuteReader();

When running the code, the issue arises at line result1 = command1.ExecuteReader();.

Possible Cause:

The error message indicates that a user is trying to execute a SELECT command on a table, but does not have the necessary permissions. This error can also occur when there is a typo in the SQL statement.

Solution:

1. Check Permissions: Verify that the user executing the query has read access to the table specified in the command.

2. Review SQL Statement: Examine the SQL statement for any typos or syntax errors. In particular, check for the following:

   • Correct table name
   • Proper column names

For example, ensure that the table name is tbl_Position and not tbl_Position.

Additional Notes:

As mentioned in the user-provided answer, a similar issue can arise when using a typo in a UNION query. If there is a non-existent table name in the statement, this type of error can result.

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