SELECT t1.form_name FROM forms AS t1 JOIN party_forms AS t2 ON t1.form_id  =  t2.form_id GROUP BY t2.form_id ORDER BY count(*) DESC LIMIT 1
SELECT t1.form_name FROM forms AS t1 JOIN party_forms AS t2 ON t1.form_id  =  t2.form_id GROUP BY t2.form_id ORDER BY count(*) DESC LIMIT 1 <table_name> : Forms col : form_id | form_type_code | service_id | form_number | form_name | form_description row 1 : 1 | Basic | 13 | 8069 | SSN Application | Form for SSN Application row 2 : 2 | Complex | 9 | 2675 | Marriage Certificate | Marriage Certificate row 3 : 3 | Complex | 2 | 9837 | Divorce  Certificate | Divorce  Certificate row 4 : 4 | Complex | 14 | 9173 | Moving Form | Form for moving house row 5 : 5 | Basic | 3 | 6673 | Account Application | Form for Account Application row 6 : 6 | Complex | 7 | 9130 | Property Change | Form for Property Change <table_name> : Party_Forms col : party_id | form_id | date_completion_started | form_status_code | date_fully_completed row 1 : 2 | 4 | 2017-12-17 11:29:47 | Completed | 2018-02-11 16:46:10 row 2 : 15 | 4 | 2017-12-16 15:25:48 | Partially Completed | 2018-02-18 16:09:04 row 3 : 8 | 5 | 2017-12-09 21:26:11 | Partially Completed | 2018-02-05 16:16:58 row 4 : 6 | 2 | 2017-12-04 16:57:31 | Partially Completed | 2018-01-28 22:29:07 row 5 : 7 | 2 | 2017-11-30 18:49:37 | Not Started | 2018-02-21 17:59:08 row 6 : 11 | 5 | 2017-12-20 01:10:33 | Not Started | 2018-02-10 14:07:46 row 7 : 11 | 3 | 2017-12-18 01:32:49 | Not Started | 2018-02-04 05:57:01 row 8 : 8 | 6 | 2017-12-07 18:17:01 | Work In Progress | 2018-02-15 23:09:42 row 9 : 5 | 6 | 2017-12-05 19:48:45 | Partially Completed | 2018-01-30 09:33:37 row 10 : 7 | 6 | 2017-11-29 03:11:38 | Not Started | 2018-02-01 10:26:47 row 11 : 13 | 3 | 2017-12-04 18:20:10 | Work In Progress | 2018-01-31 17:09:32 row 12 : 2 | 5 | 2017-11-26 09:09:29 | Not Started | 2018-02-09 09:49:09 row 13 : 9 | 2 | 2017-11-27 11:57:03 | Completed | 2018-02-15 13:15:25
col : form_name row 1 : Marriage Certificate