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How to drop a table in hive?
Drop Table Statement
- The DROP TABLE statement is used to drop an existing table in a database.
- The SQL DROP TABLE statement allows you to remove or delete a table from the SQL database.
- DROP TABLE statement can be used to remove a table with its associated indexes and data
Syntax:
DROP TABLE [IF EXISTS] table_name;
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- The following query drops a table named employee:
hive> DROP TABLE IF EXISTS employee;
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Output:
OK
Time taken: 5.3 seconds
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JDBC Program
- The following JDBC program drops the employee table.
import java.sql.SQLException;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;
import java.sql.DriverManager;
public class HiveDropTable {
private static String driverName = "org.apache.hadoop.hive.jdbc.HiveDriver";
public static void main(String[] args) throws SQLException {
// Register driver and create driver instance
Class.forName(driverName);
// get connection
Connection con = DriverManager.getConnection("jdbc:hive://localhost:10000/userdb", "", "");
// create statement
Statement stmt = con.createStatement();
// execute statement
stmt.executeQuery("DROP TABLE IF EXISTS employee;");
System.out.println("Drop table successful.");
con.close();
}
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- The following query is used to verify the list of tables:
Syntax:
hive> SHOW TABLES;
emp
ok
Time taken: 2.1 seconds
hive>
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- The following commands given are used to compile and execute this program.
Code:
$ javac HiveDropTable.java
$ java HiveDropTable
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Output:
Drop table successful