Mysql connect 3 tables with if case or maybe Join? - mysql

Question

I have 3 tables and I have to connect them. The main table that consist all records for group trainings or individual trainings is called blocked_dates. The group trainings can be recognized if group_id > 0. If group_id = 0 than reservation_id shows that the reservation is for individual training..
I must get somehow the training id and the training date from either table **group_member_reservations ** or table reservations
Table blocked_dates
When blocked_dates.group_id > 0 the query must get id, training_date from table
`group_member_reservations for all records that have :
group_member_reservations.bdid = blocked_dates.id and
blocked_dates.blocked_date= group_member_reservations.training_date and
blocked_dates.group_id = group_member_reservations. group_id and
group_member_reservations.anulated = “0” and
group_member_reservations. paid_status = “not_paid”
The table that has all records for group trainings is called group_member_reservationsand has the following structure
When blocked_dates. reservation_id > 0 the query must get id, date from table reservations for all records that have:
reservations.id = blocked_dates.reservation_id and
reservations.status = “1” and
reservations.paid_status = “not_paid”
Here is the structure of table reservations
Can I request the needed information with one query. I hope I had explained correctly the desired results. Thanks for your time in advance
*** Here are the tables structure:
-- Table structure for table blocked_dates
DROP TABLE IF EXISTS `blocked_dates`;
CREATE TABLE `blocked_dates` (
`id` int(11) NOT NULL,
`customer_id` int(11) NOT NULL DEFAULT 0,
`group_id` int(11) NOT NULL DEFAULT 0,
`reservation_id` int(11) NOT NULL DEFAULT 0,
`blocked_date` date NOT NULL DEFAULT '0000-00-00',
`anulated` enum('0','1') CHARACTER SET utf8 NOT NULL DEFAULT '0'
) ENGINE=MyISAM DEFAULT CHARSET=utf8;
--
-- Table structure for table group_members_reservations
DROP TABLE IF EXISTS `group_members_reservations`;
CREATE TABLE `group_members_reservations` (
`id` int(11) NOT NULL,
`bdid` int(11) NOT NULL DEFAULT 0,
`group_id` int(1) NOT NULL DEFAULT 0,
`training_date` date NOT NULL DEFAULT '0000-00-00',
`paid_status` enum('paid','not_paid') NOT NULL DEFAULT 'not_paid',
`anulated` enum('0','1') NOT NULL DEFAULT '0'
) ENGINE=MyISAM DEFAULT CHARSET=utf8;
--
-- Table structure for table reservations
DROP TABLE IF EXISTS `reservations`;
CREATE TABLE `reservations` (
`id` int(11) NOT NULL,
`customer_id` int(11) NOT NULL,
`date` date NOT NULL DEFAULT '0000-00-00',
`status` int(1) NOT NULL DEFAULT 1 COMMENT '1-open;2-canceled_by_customer;3-canceled_by_admin',
`paid_status` enum('paid','not_paid') CHARACTER SET utf8 NOT NULL DEFAULT 'not_paid'
) ENGINE=MyISAM DEFAULT CHARSET=utf8;
Insert statement
INSERT INTO `blocked_dates` VALUES(1, 2, 0, 1, '2021-08-01', '0');
INSERT INTO `blocked_dates` VALUES(2, 0, 1, 0, '2021-08-01', '0');
INSERT INTO `blocked_dates` VALUES(3, 0, 2, 0, '2021-08-01', '0');
INSERT INTO `blocked_dates` VALUES(4, 3, 0, 2, '2021-08-01', '0');
INSERT INTO `group_members_reservations` VALUES(1, 2, 1, '2021-08-01', 'not_paid', '0');
INSERT INTO `group_members_reservations` VALUES(2, 3, 2, '2021-08-01', 'not_paid', '0');
INSERT INTO `reservations` VALUES(1, 2, '2021-08-01', 1, 'not_paid');
INSERT INTO `reservations` VALUES(2, 3, '2021-08-01', 2, 'not_paid');
COMMIT;