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error when using the sum function in sqlite

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http://stackoverflow.com – My application want to calculate the total sales in a month. I used sql statements sum. But when I run the application it fails. and I do not know why this error. expect people to help me fix this. I am very thankful. Code DB_Adapter public class DB_Adapter { public static final String DATE="date"; public static final String COST = "cost"; public static final String SALES = "sales"; public static final String NUMBER = "number"; public static final String PROFIT = "profit"; public static final String DB_NAME = "SAIGONFLEAMARKET"; public static final String DB_TABLE = "shipment"; public static (HowTos)