INSERT and primary key uniqueness violations
In many relational databases, if you try to insert a row that has already been inserted, the operation can fail because the primary key gets duplicated. Impala, however, does not fail the query. Instead, it generates a warning and continues to run the remainder of the insert statement.
If you
want to replace existing rows from the table, use the
UPSERT statement instead.
INSERT INTO my_first_table VALUES (99, "sarah");
UPSERT INTO my_first_table VALUES (99, "zoe");zoe. 