SELECT t1.party_email FROM parties AS t1 JOIN party_services AS t2 ON t1.party_id  =  t2.customer_id GROUP BY t1.party_email ORDER BY count(*) DESC LIMIT 1
SELECT t1.party_email FROM parties AS t1 JOIN party_services AS t2 ON t1.party_id  =  t2.customer_id GROUP BY t1.party_email ORDER BY count(*) DESC LIMIT 1 <table_name> : Parties col : party_id | payment_method_code | party_phone | party_email row 1 : 1 | Cheque | 05374656172 | enrico09@example.com row 2 : 2 | Credit Card | 1-525-947-7867x51521 | brakus.aliya@example.com row 3 : 3 | Cheque | 1-606-232-3728x3568 | frida57@example.org row 4 : 4 | Cash | 019-302-5166 | wuckert.misty@example.com row 5 : 5 | Cheque | 529-074-5348 | alanna.boehm@example.net row 6 : 6 | Credit Card | 1-950-874-1693x65923 | daniel.charity@example.net row 7 : 7 | Direct Debit | 112-477-4433x137 | lucinda83@example.org row 8 : 8 | Cash | (919)169-1514x55820 | erick.mills@example.com row 9 : 9 | Cash | 04177934231 | evie97@example.org row 10 : 10 | Credit Card | (211)528-0733x8063 | hilll.elyssa@example.net row 11 : 11 | Credit Card | 1-985-957-5462 | jamir.hyatt@example.net row 12 : 12 | Cheque | 1-386-339-9244 | eden67@example.net row 13 : 13 | Direct Debit | 186-726-9855 | ora.hyatt@example.net row 14 : 14 | Cash | 971-607-7001x08626 | rhauck@example.org row 15 : 15 | Cash | 231.232.0099 | noe.ziemann@example.org <table_name> : Party_Services col : booking_id | customer_id | service_id | service_datetime | booking_made_date row 1 : 1 | 10 | 12 | 2018-03-10 22:43:12 | 2018-03-23 23:56:51 row 2 : 2 | 14 | 11 | 2018-03-05 15:06:23 | 2018-03-25 11:08:29 row 3 : 3 | 4 | 7 | 2018-03-08 10:39:29 | 2018-03-24 11:09:52 row 4 : 4 | 13 | 3 | 2018-03-08 23:52:44 | 2018-03-25 12:56:09 row 5 : 5 | 2 | 6 | 2018-03-17 18:35:26 | 2018-03-25 02:57:32 row 6 : 6 | 14 | 6 | 2018-03-17 08:16:30 | 2018-03-24 06:50:50 row 7 : 7 | 6 | 12 | 2018-03-15 09:48:27 | 2018-03-25 11:52:29 row 8 : 8 | 3 | 6 | 2018-03-01 18:31:32 | 2018-03-24 07:55:33 row 9 : 9 | 5 | 7 | 2018-03-05 13:02:22 | 2018-03-24 10:17:36 row 10 : 10 | 15 | 13 | 2018-02-28 16:29:04 | 2018-03-24 09:20:46 row 11 : 11 | 13 | 12 | 2018-03-09 07:27:30 | 2018-03-25 15:09:54 row 12 : 12 | 9 | 1 | 2018-03-19 14:38:29 | 2018-03-24 18:05:07 row 13 : 13 | 3 | 11 | 2018-03-14 18:53:35 | 2018-03-24 12:21:20 row 14 : 14 | 3 | 5 | 2018-03-18 17:53:02 | 2018-03-24 22:12:30 row 15 : 15 | 12 | 6 | 2018-03-01 04:41:58 | 2018-03-25 16:47:47
col : party_email row 1 : frida57@example.org