Unable to delete columns from SQLite table [android]

db.execSQL("CREATE TEMPORARY TABLE Evaluation_backup(" + allColumnName + ");" 
 + "INSERT INTO Evaluation_backup SELECT "+ allColumnName +" FROM Evaluation;"
 + "DROP TABLE Evaluation;" 
 + "CREATE TABLE Evaluation("+ allColumnName + ");" 
 + "INSERT INTO Evaluation SELECT "+ allColumnName + "FROM Evaluation_backup;"
 + "DROP TABLE Evaluation_backup;");

Because I can’t comment here: How do I delete column from sqlite table in android?

The method I did does not work at all, the column still exists. This is my SQL:

db.execSQL("CREATE TEMPORARY TABLE Evaluation_backup(" + allColumnName + ");" 
 + "INSERT INTO Evaluation_backup SELECT "+ allColumnName +" FROM Evaluation;"
 + "DROP TABLE Evaluation;" < br /> + "CREATE TABLE Evaluation("+ allColumnName + ");" 
 + "INSERT INTO Evaluation SELECT "+ allColumnName +" FROM Evaluation_backup;"
 + "DROP TABLE Evaluation_backup;");< /pre> 

allColumnName is String containing all column names except the name of the column to be deleted. The content of allColumnName is as follows: column1,column2,column3.
Thanks in advance.

documentation for execSql says: 


Execute a single SQL statement …< /p> 
Call db.execSql once for each statement.