The table "custom" is defined below. The "id" column and "introducer" column are of INTEGER type, and the "email" column is of TEXT type. id | email | introducer ----+-----------------+…

The table "custom" is defined below. The "id" column and "introducer" column are of INTEGER type, and the "email" column is of TEXT type. id | email | introducer ----+-----------------+------------ 2 | [email protected] | 1 3 | [email protected] | 2 4 | [email protected] | 2 Three SQL statements were executed in the following order: INSERT INTO custom SELECT max(id) + 1, '[email protected]', 4 FROM custom; UPDATE custom SET introducer = 999 WHERE email = '[email protected]'; DELETE FROM custom WHERE introducer NOT IN (SELECT id FROM custom); Select the number of rows in the "custom" table after the execution.