Drop table if exists test

DECLARE								-- Oracle
    existing_table number;			
BEGIN
    SELECT count(*) into existing_table FROM ALL_TABLES
    WHERE TABLE_NAME = 'table_name' AND OWNER = 'owner';
    IF existing_table = 1 then
        EXECUTE IMMEDIATE 'DROP TABLE owner.table_name';
    END IF;
END;
/
CREATE TABLE owner.table_name (BDAY DATE, [...]);

If table exists drop

IF EXISTS(SELECT *
          FROM   dbo.Scores)
  DROP TABLE dbo.Scores

Source: stackoverflow.com

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