Paste this into a new question or an answer at dba.stackexchange.com:
<!-- -->
> CREATE TABLE `buz_usertype` (
> `User_type` varchar(30) NOT NULL,
> `Type_id` tinyint NOT NULL AUTO_INCREMENT,
> PRIMARY KEY (`Type_id`)
> );
>
>
>
> CREATE TABLE `users` (
> `user_ID` mediumint unsigned NOT NULL AUTO_INCREMENT,
> `name` varchar(225) DEFAULT NULL,
> `lastname` varchar(255) DEFAULT NULL,
> `email` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
> `password` varchar(255) DEFAULT NULL,
> `usertype` tinyint unsigned NOT NULL,
> `Reg_date_time` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP,
> `registr_hash` char(32) DEFAULT NULL,
> `active` tinyint unsigned NOT NULL DEFAULT '0',
> `reset_pass_token` char(40) DEFAULT NULL,
> `token_expire` int unsigned DEFAULT NULL,
> `fb_user_ID` bigint DEFAULT NULL,
> `fb_user` tinyint unsigned DEFAULT '0',
> `del_account_time` timestamp NULL DEFAULT NULL,
> PRIMARY KEY (`user_ID`),
> UNIQUE KEY `email_UNIQUE` (`email`),
> KEY `fk_users_user_type1_idx` (`usertype`)
> );
>
>
> CREATE TABLE `business_users` (
> `bus_user_ID` mediumint unsigned NOT NULL AUTO_INCREMENT,
> `user_ID` mediumint unsigned NOT NULL,
> `comp_name` varchar(255) DEFAULT NULL,
> `address` varchar(100) DEFAULT NULL,
> `url` varchar(2083) DEFAULT NULL,
> `phone` varchar(20) DEFAULT NULL,
> `city` varchar(50) DEFAULT NULL,
> `municipality` varchar(100) DEFAULT NULL,
> `bus_user_type` tinyint NOT NULL,
> `same_d_appt` tinyint(1) NOT NULL DEFAULT '0',
> `f_words` tinytext,
> `apps_timeslot` tinyint unsigned DEFAULT NULL,
> `pack_selected` tinyint unsigned NOT NULL,
> `sched_entered` tinyint(1) NOT NULL DEFAULT '0',
> `holiday_closed` tinyint(1) NOT NULL DEFAULT '1',
> `staff_engage_in_appt` tinyint(1) DEFAULT NULL,
> `services_entered` tinyint(1) NOT NULL DEFAULT '0',
> `staff_entered` tinyint(1) DEFAULT NULL,
> `business_user_img_path` varchar(100) DEFAULT NULL,
> PRIMARY KEY (`bus_user_ID`),
> UNIQUE KEY `user_ID` (`user_ID`)
> );
>
> CREATE TABLE `appointments` (
> `apID` int unsigned NOT NULL AUTO_INCREMENT,
> `Bookfrom` varchar(45) DEFAULT NULL,
> `bookedfor` mediumint unsigned DEFAULT NULL,
> `appont_close_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
> `startDate` date NOT NULL,
> `startime` time NOT NULL,
> `endDate` date DEFAULT NULL,
> `endTime` time DEFAULT NULL,
> `apps_origin` enum('frontend','backend') NOT NULL,
> `delete_back` tinyint unsigned DEFAULT NULL,
> `delete_front` tinyint(1) DEFAULT NULL,
> `bookfromID` mediumint unsigned DEFAULT NULL,
> PRIMARY KEY (`apID`)
> );
>
> CREATE TABLE `staff_list` (
> `staff_ID` int unsigned NOT NULL AUTO_INCREMENT,
> `st_name` varchar(255) NOT NULL,
> `business_user_id` mediumint unsigned NOT NULL,
> `staff_image_path` varchar(100) DEFAULT NULL,
> PRIMARY KEY (`staff_ID`)
> );
>
> CREATE TABLE `services_list` (
> `serviceID` int NOT NULL AUTO_INCREMENT,
> `price` decimal(5,2) DEFAULT NULL,
> `servicename` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
> `duration` smallint unsigned DEFAULT NULL,
> `prices_visib` tinyint(1) DEFAULT NULL,
> `business_user_id` mediumint unsigned NOT NULL,
> PRIMARY KEY (`serviceID`)
> );
>
> CREATE TABLE `appoint_servi_chosen` (
> `app_ID` int unsigned NOT NULL,
> `service_ID` int NOT NULL,
> PRIMARY KEY (`app_ID`,`service_ID`)
> );
>
> CREATE TABLE `appoint_staff_chosen` (
> `app_ID` int unsigned NOT NULL,
> `staff_id` int unsigned NOT NULL,
> PRIMARY KEY (`app_ID`,`staff_id`)
> );
>
> INSERT INTO `appointments` (`apID`,`Bookfrom`,`bookedfor`,`appont_close_time`,`startDate`,`startime`,`endDate`,`endTime`,`apps_origin`,`delete_back`,`delete_front`,`bookfromID`) VALUES (103,'giannis',267,'2021-11-06 11:19:44','2021-11-18','10:00:00','2021-11-18','11:00:00','backend',NULL,NULL,NULL);
> INSERT INTO `appointments` (`apID`,`Bookfrom`,`bookedfor`,`appont_close_time`,`startDate`,`startime`,`endDate`,`endTime`,`apps_origin`,`delete_back`,`delete_front`,`bookfromID`) VALUES (104,'nikos',267,'2021-11-06 11:19:44','2021-11-16','10:00:00','2021-11-16','11:00:00','frontend',NULL,NULL,'191');
>
> INSERT INTO `services_list` (`serviceID`,`price`,`servicename`,`duration`,`prices_visib`,`business_user_id`) VALUES (44,NULL,'haircut',30,NULL,267);
> INSERT INTO `services_list` (`serviceID`,`price`,`servicename`,`duration`,`prices_visib`,`business_user_id`) VALUES (45,NULL,'haircut',NULL,NULL,272);
> INSERT INTO `services_list` (`serviceID`,`price`,`servicename`,`duration`,`prices_visib`,`business_user_id`) VALUES (46,NULL,'other',NULL,NULL,270);
> INSERT INTO `services_list` (`serviceID`,`price`,`servicename`,`duration`,`prices_visib`,`business_user_id`) VALUES (48,NULL,'pediciur',30,NULL,267);
>
> INSERT INTO `staff_list` (`staff_ID`,`st_name`,`business_user_id`,`staff_image_path`) VALUES (14,'eleni',270,NULL);
>
> INSERT INTO `appoint_servi_chosen` (`app_ID`,`service_ID`) VALUES (104,44);
> INSERT INTO `appoint_servi_chosen` (`app_ID`,`service_ID`) VALUES (104,48);
>
> INSERT INTO `appoint_staff_chosen` (`app_ID`,`staff_id`) VALUES (104,14);
>
> INSERT INTO `users` (`user_ID`,`name`,`lastname`,`email`,`password`,`usertype`,`Reg_date_time`,`registr_hash`,`active`,`reset_pass_token`,`token_expire`,`fb_user_ID`,`fb_user`,`del_account_time`) VALUES (191,'Dimitris','mitropoulos','foryou1911@gmail.com','$2y$10$F4jDcuLi3CTahzxTfetIwOINukqey90ZlQRt6CmAZrBMJE2DfvxgS',1,'2021-09-05 17:44:48','8d5e957f297893487bd98fa830fa6413',1,NULL,NULL,NULL,0,NULL);
> INSERT INTO `users` (`user_ID`,`name`,`lastname`,`email`,`password`,`usertype`,`Reg_date_time`,`registr_hash`,`active`,`reset_pass_token`,`token_expire`,`fb_user_ID`,`fb_user`,`del_account_time`) VALUES (154,'Dimitris','Παπαγεωριου','papageorgiou40@hotmail.com','$2y$10$6t1fPDeHVQCl2x3yp0JIXuHbDzHDYg8PUviz9rPTpRc3rpegm5Gam',2,'2021-06-30 13:56:59','da4fb5c6e93e74d3df8527599fa62642',1,NULL,NULL,NULL,0,NULL);
>
>
> INSERT INTO `business_users` (`bus_user_ID`,`user_ID`,`comp_name`,`address`,`url`,`phone`,`city`,`municipality`,`bus_user_type`,`same_d_appt`,`f_words`,`apps_timeslot`,`pack_selected`,`sched_entered`,`holiday_closed`,`staff_engage_in_appt`,`services_entered`,`staff_entered`,`business_user_img_path`) VALUES (267,154,NULL,'Filoproodon 12st',NULL,'6973999099','Athens',NULL,1,1,NULL,NULL,1,1,1,NULL,1,NULL,NULL);
>
> INSERT INTO `buz_usertype` (`User_type`,`Type_id`) VALUES ('hairStylist',1);
>
>
>
> SELECT * FROM appointments;
> SELECT * FROM services_list;
> SELECT * FROM appoint_servi_chosen;
>
>
>
> SELECT IF(business_users.comp_name IS NULL,CONCAT(users.name," ", users.lastname),business_users.comp_name) AS name,
> startDate,startime,User_type,apID
> FROM appointments
> INNER JOIN business_users
> ON appointments.bookedfor = business_users.bus_user_ID
> INNER JOIN users
> ON business_users.user_ID=users.user_ID
> INNER JOIN buz_usertype
> ON business_users.bus_user_type=buz_usertype.Type_id
> WHERE apps_origin ="frontend"
> AND delete_front is null
> AND bookfromID=(SELECT user_ID from users WHERE users.email='foryou1911@gmail.com');
>
>
> SELECT serviceID,servicename from services_list
> INNER JOIN appoint_servi_chosen
> ON appoint_servi_chosen.service_ID=services_list.serviceID
> AND app_ID='104';
>
>
>
> --SELECT * FROM staff_list;
> --SELECT * FROM appoint_staff_chosen;
>
> --SELECT * FROM business_users;
>
> --SELECT * FROM users;
>
> --SELECT * FROM buz_usertype;
>
>
>
>
> --queries follow for getting appointments from the db and services associated with an appt
>
> --QUERY for appt
>
>
>
> <pre>
> ✓
>
> ✓
>
> ✓
>
> ✓
>
> ✓
>
> ✓
>
> ✓
>
> ✓
>
> ✓
>
> ✓
>
> ✓
>
> ✓
>
> ✓
>
> ✓
>
> ✓
>
> ✓
>
> ✓
>
> ✓
>
> ✓
>
> ✓
>
> ✓
>
> ✓
>
> apID | Bookfrom | bookedfor | appont_close_time | startDate | startime | endDate | endTime | apps_origin | delete_back | delete_front | bookfromID
> ---: | :------- | --------: | :------------------ | :--------- | :------- | :--------- | :------- | :---------- | ----------: | -----------: | ---------:
> 103 | giannis | 267 | 2021-11-06 11:19:44 | 2021-11-18 | 10:00:00 | 2021-11-18 | 11:00:00 | backend | <em>null</em> | <em>null</em> | <em>null</em>
> 104 | nikos | 267 | 2021-11-06 11:19:44 | 2021-11-16 | 10:00:00 | 2021-11-16 | 11:00:00 | frontend | <em>null</em> | <em>null</em> | 191
>
> serviceID | price | servicename | duration | prices_visib | business_user_id
> --------: | ----: | :---------- | -------: | -----------: | ---------------:
> 44 | <em>null</em> | haircut | 30 | <em>null</em> | 267
> 45 | <em>null</em> | haircut | <em>null</em> | <em>null</em> | 272
> 46 | <em>null</em> | other | <em>null</em> | <em>null</em> | 270
> 48 | <em>null</em> | pediciur | 30 | <em>null</em> | 267
>
> app_ID | service_ID
> -----: | ---------:
> 104 | 44
> 104 | 48
>
> name | startDate | startime | User_type | apID
> :------------------------------ | :--------- | :------- | :---------- | ---:
> Dimitris Παπαγεωριου | 2021-11-16 | 10:00:00 | hairStylist | 104
>
> serviceID | servicename
> --------: | :----------
> 44 | haircut
> 48 | pediciur
> </pre>
*db<>fiddle [here](https://dbfiddle.uk/?rdbms=mysql_8.0&fiddle=05fc283a3674472737bffcaca98c2b4f)*
back to fiddle