วันนี้ 20 กุมภาพันธ์ 2559 เป็นวันที่วงพอสกลับมามีเพลงให้ฟังอีกครั้งชื่อเพลง “รักอยู่รอบกาย” เราก็รอฟังเพลงนะ เพลงที่เป็นเสียงร้องของคุณโจ้ แต่ก็มีดราม่านิดหน่อยแต่เราก็รอฟังจากแหล่ง Official นะ รอฟังแบบตื่นเต้นเลย
ช่วงที่รอฟังเพลงด้วย อ่านการ์ตูนไปเรื่อยเปื่อย (นี่คือช่วงว่างแว๊บนึงจริง ๆ ) นึกถึงรายงานทางด้านสาธารณสุขรายงานหนึ่งที่คนขอรายงานมักจะบอกว่า “Re-Visit โรค XX ภายใน YY ชั่วโมง/วัน นะ” ทำนองนี้ คำว่า Re-Visit ง่าย ๆ บ้าน ๆ ก็คือการกลับมารักษาซ้ำด้วยโรคเดิม จะสาเหตุหนึ่ง สอง สาม หรืออะไรก็แล้วแต่ ซึ่งกลุ่มรายงานนี้มักจะถูกนำมาเป็น CQI ของโรงพยาบาลด้วย
เรื่องคุณภาพเรื่องนั้นจบไปหล่ะกัน แต่เราในฐานะของนักคอมพิวเตอร์ที่จะนำเสนอข้อมูลตรงนั้นออกมา มาดูหนึ่งในวิธีในการเรียกดูข้อมูล Re-Visit ออกมากันดีกว่า
สมมุติว่าเรามีข้อมูลดัมมี่ หุ่นนิ่ง ๆ ตั้งไว้หล่ะกัน (เราใช้บริการจากเว็บ www.generatedata.com เหมือนเดิม ทุกอย่างสมมุติหมดนะ วันที่เอย โรคเอย เผื่อสงสัย)
id เป็น PK เฉย ๆ- HN เป็น Hospital Number ใครไปโรงพยาบาล ก็จะได้ยินคำนี้ คือรหัสที่โรงพยาบาลตั้งขึ้นแทนตัวบุคคลเพื่อไม่ให้ซ้ำกันหล่ะกัน
- VisitDateTime เป็นวันที่เข้าทำการรักษา
- PDX เป็นโรคที่วินิจฉัย
สมมุติมีข้อมูลประมาณนี้
DROP TABLE IF EXISTS `Visit`;
CREATE TABLE IF NOT EXISTS `Visit` (
`id` mediumint(9) NOT NULL,
`HN` varchar(255) DEFAULT NULL,
`VisitDateTime` datetime(6) DEFAULT NULL,
`PDX` varchar(255) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
TRUNCATE TABLE `Visit`;
INSERT DELAYED INTO `Visit` VALUES
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(1001, '10', '2016-08-01 12:21:00.000000', 'J069'),
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(1008, '7', '2015-02-24 12:59:00.000000', 'J069'),
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(1010, '2', '2015-04-21 12:29:00.000000', 'Z00'),
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(1012, '7', '2016-07-12 12:09:00.000000', 'E119'),
(1013, '6', '2016-02-04 12:29:00.000000', 'Z480'),
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(1098, '7', '2016-12-08 12:38:00.000000', 'Z000'),
(1099, '6', '2015-08-26 12:00:00.000000', 'Z00');
--
-- Indexes for table `Visit`
--
ALTER TABLE `Visit`
ADD PRIMARY KEY (`id`);
DROP TABLE IF EXISTS `Visit`;
CREATE TABLE IF NOT EXISTS `Visit` (
`id` mediumint(9) NOT NULL,
`HN` varchar(255) DEFAULT NULL,
`VisitDateTime` datetime(6) DEFAULT NULL,
`PDX` varchar(255) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
TRUNCATE TABLE `Visit`;
INSERT DELAYED INTO `Visit` VALUES
(1000, '10', '2015-12-28 12:03:00.000000', 'Z133'),
(1001, '10', '2016-08-01 12:21:00.000000', 'J069'),
(1002, '9', '2015-11-25 12:42:00.000000', 'K30'),
(1003, '4', '2015-07-13 12:14:00.000000', 'Z00'),
(1004, '10', '2015-12-21 12:20:00.000000', 'U77'),
(1005, '4', '2015-08-31 12:16:00.000000', 'K30'),
(1006, '3', '2016-05-26 12:16:00.000000', 'Z00'),
(1007, '10', '2015-04-29 12:10:00.000000', 'K30'),
(1008, '7', '2015-02-24 12:59:00.000000', 'J069'),
(1009, '10', '2016-06-06 12:11:00.000000', 'Z00'),
(1010, '2', '2015-04-21 12:29:00.000000', 'Z00'),
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(1013, '6', '2016-02-04 12:29:00.000000', 'Z480'),
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--
-- Indexes for table `Visit`
--
ALTER TABLE `Visit`
ADD PRIMARY KEY (`id`);
DROP TABLE IF EXISTS `Visit`; CREATE TABLE IF NOT EXISTS `Visit` ( `id` mediumint(9) NOT NULL, `HN` varchar(255) DEFAULT NULL, `VisitDateTime` datetime(6) DEFAULT NULL, `PDX` varchar(255) DEFAULT NULL ) ENGINE=InnoDB DEFAULT CHARSET=utf8; TRUNCATE TABLE `Visit`; INSERT DELAYED INTO `Visit` VALUES (1000, '10', '2015-12-28 12:03:00.000000', 'Z133'), (1001, '10', '2016-08-01 12:21:00.000000', 'J069'), (1002, '9', '2015-11-25 12:42:00.000000', 'K30'), (1003, '4', '2015-07-13 12:14:00.000000', 'Z00'), (1004, '10', '2015-12-21 12:20:00.000000', 'U77'), (1005, '4', '2015-08-31 12:16:00.000000', 'K30'), (1006, '3', '2016-05-26 12:16:00.000000', 'Z00'), (1007, '10', '2015-04-29 12:10:00.000000', 'K30'), (1008, '7', '2015-02-24 12:59:00.000000', 'J069'), (1009, '10', '2016-06-06 12:11:00.000000', 'Z00'), (1010, '2', '2015-04-21 12:29:00.000000', 'Z00'), (1011, '5', '2016-02-09 12:08:00.000000', 'Z000'), (1012, '7', '2016-07-12 12:09:00.000000', 'E119'), (1013, '6', '2016-02-04 12:29:00.000000', 'Z480'), (1014, '3', '2016-10-31 12:52:00.000000', 'Z133'), (1015, '7', '2015-05-24 12:47:00.000000', 'Z133'), (1016, '7', '2016-01-01 12:34:00.000000', 'Z000'), (1017, '3', '2015-08-01 12:11:00.000000', 'Z133'), (1018, '8', '2016-02-22 12:27:00.000000', 'U77'), (1019, '6', '2015-08-29 12:54:00.000000', 'Z480'), (1020, '1', '2016-02-28 12:43:00.000000', 'E119'), (1021, '8', '2015-10-18 12:19:00.000000', 'Z480'), (1022, '7', '2016-05-29 12:30:00.000000', 'Z133'), (1023, '1', '2016-07-23 12:47:00.000000', 'J069'), (1024, '3', '2015-12-08 12:42:00.000000', 'Z00'), (1025, '7', '2016-12-08 12:45:00.000000', 'U77'), (1026, '5', '2016-12-10 12:42:00.000000', 'Z480'), (1027, '3', '2015-05-21 12:19:00.000000', 'Z480'), (1028, '7', '2016-11-28 12:45:00.000000', 'U77'), (1029, '7', '2015-06-27 12:16:00.000000', 'J00'), (1030, '10', '2015-08-23 12:33:00.000000', 'E119'), (1031, '5', '2015-12-05 12:22:00.000000', 'Z9912'), (1032, '8', '2016-12-27 12:27:00.000000', 'Z133'), (1033, '1', '2016-05-01 12:12:00.000000', 'E119'), (1034, '9', '2015-07-06 12:26:00.000000', 'Z133'), (1035, '3', '2015-07-05 12:49:00.000000', 'Z9912'), (1036, '3', '2015-03-03 12:35:00.000000', 'J00'), (1037, '1', '2016-09-07 12:25:00.000000', 'U77'), (1038, '8', '2016-03-31 12:25:00.000000', 'K30'), (1039, '9', '2016-03-21 12:51:00.000000', 'Z000'), (1040, '3', '2015-03-11 12:38:00.000000', 'Z480'), (1041, '2', '2016-10-12 12:29:00.000000', 'Z000'), (1042, '4', '2016-08-13 12:04:00.000000', 'E119'), (1043, '8', '2015-11-10 12:13:00.000000', 'E119'), (1044, '5', '2016-07-08 12:57:00.000000', 'Z133'), (1045, '6', '2015-05-12 12:05:00.000000', 'J069'), (1046, '8', '2016-01-23 12:27:00.000000', 'U77'), (1047, '2', '2016-01-21 12:03:00.000000', 'J00'), (1048, '4', '2015-12-29 12:38:00.000000', 'K30'), (1049, '2', '2016-10-02 12:26:00.000000', 'Z133'), (1050, '8', '2015-06-07 12:40:00.000000', 'Z000'), (1051, '10', '2015-07-21 12:33:00.000000', 'Z9912'), (1052, '2', '2017-02-08 12:02:00.000000', 'K30'), (1053, '2', '2015-08-26 12:34:00.000000', 'U77'), (1054, '4', '2017-02-05 12:52:00.000000', 'Z133'), (1055, '7', '2016-05-07 12:07:00.000000', 'J069'), (1056, '2', '2016-12-20 12:57:00.000000', 'Z480'), (1057, '5', '2015-04-07 12:39:00.000000', 'U77'), (1058, '6', '2015-08-24 12:52:00.000000', 'E119'), (1059, '6', '2015-08-10 12:54:00.000000', 'K30'), (1060, '5', '2016-01-09 12:19:00.000000', 'Z000'), (1061, '1', '2015-05-26 12:31:00.000000', 'K30'), (1062, '7', '2017-02-05 12:46:00.000000', 'J00'), (1063, '7', '2016-12-24 12:16:00.000000', 'Z480'), (1064, '1', '2016-01-20 12:04:00.000000', 'Z480'), (1065, '6', '2016-01-06 12:38:00.000000', 'U77'), (1066, '4', '2015-12-19 12:56:00.000000', 'E119'), (1067, '1', '2016-11-29 12:37:00.000000', 'J069'), (1068, '9', '2015-03-26 12:36:00.000000', 'U77'), (1069, '1', '2016-08-17 12:01:00.000000', 'K30'), (1070, '3', '2016-02-26 12:42:00.000000', 'J069'), (1071, '6', '2016-08-23 12:17:00.000000', 'J00'), (1072, '10', '2016-03-19 12:54:00.000000', 'Z9912'), (1073, '1', '2017-02-18 12:31:00.000000', 'Z000'), (1074, '9', '2016-02-05 12:51:00.000000', 'Z480'), (1075, '9', '2015-11-14 12:30:00.000000', 'K30'), (1076, '6', '2015-03-23 12:34:00.000000', 'E119'), (1077, '10', '2015-08-26 12:11:00.000000', 'Z9912'), (1078, '9', '2015-05-04 12:58:00.000000', 'Z480'), (1079, '9', '2016-01-04 12:47:00.000000', 'U77'), (1080, '8', '2016-03-28 12:53:00.000000', 'Z480'), (1081, '6', '2016-03-21 12:05:00.000000', 'Z480'), (1082, '6', '2016-07-05 12:16:00.000000', 'Z000'), (1083, '3', '2015-06-19 12:00:00.000000', 'Z133'), (1084, '1', '2016-05-19 12:26:00.000000', 'Z000'), (1085, '6', '2015-12-15 12:05:00.000000', 'U77'), (1086, '5', '2015-05-31 12:28:00.000000', 'Z9912'), (1087, '2', '2015-05-25 12:53:00.000000', 'K30'), (1088, '6', '2016-11-09 12:51:00.000000', 'J069'), (1089, '5', '2016-07-24 12:22:00.000000', 'J069'), (1090, '10', '2016-12-11 12:22:00.000000', 'J069'), (1091, '1', '2015-09-25 12:37:00.000000', 'J069'), (1092, '9', '2015-06-26 12:13:00.000000', 'Z133'), (1093, '8', '2016-10-24 12:21:00.000000', 'Z000'), (1094, '1', '2017-01-25 12:07:00.000000', 'Z00'), (1095, '5', '2015-09-21 12:21:00.000000', 'E119'), (1096, '6', '2017-02-05 12:05:00.000000', 'Z480'), (1097, '4', '2016-05-13 12:52:00.000000', 'Z9912'), (1098, '7', '2016-12-08 12:38:00.000000', 'Z000'), (1099, '6', '2015-08-26 12:00:00.000000', 'Z00'); -- -- Indexes for table `Visit` -- ALTER TABLE `Visit` ADD PRIMARY KEY (`id`);
ข้อมูล Re-Visit ในที่นี้หมายถึงมีการเข้ามารักษาซ้ำ (ในโรคเดิม) เช่น
+------+------+----------------------------+-------+
| id | HN | VisitDateTime | PDX |
+------+------+----------------------------+-------+
| 1033 | 1 | 2016-05-01 12:12:00.000000 | E119 |
| 1020 | 1 | 2016-02-28 12:43:00.000000 | E119 |
| 1067 | 1 | 2016-11-29 12:37:00.000000 | J069 |
| 1023 | 1 | 2016-07-23 12:47:00.000000 | J069 |
| 1091 | 1 | 2015-09-25 12:37:00.000000 | J069 |
| 1069 | 1 | 2016-08-17 12:01:00.000000 | K30 |
| 1061 | 1 | 2015-05-26 12:31:00.000000 | K30 |
| 1037 | 1 | 2016-09-07 12:25:00.000000 | U77 |
+------+------+----------------------------+-------+
| id | HN | VisitDateTime | PDX |
+------+------+----------------------------+-------+
| 1033 | 1 | 2016-05-01 12:12:00.000000 | E119 |
| 1020 | 1 | 2016-02-28 12:43:00.000000 | E119 |
| 1067 | 1 | 2016-11-29 12:37:00.000000 | J069 |
| 1023 | 1 | 2016-07-23 12:47:00.000000 | J069 |
| 1091 | 1 | 2015-09-25 12:37:00.000000 | J069 |
| 1069 | 1 | 2016-08-17 12:01:00.000000 | K30 |
| 1061 | 1 | 2015-05-26 12:31:00.000000 | K30 |
| 1037 | 1 | 2016-09-07 12:25:00.000000 | U77 |
+------+------+----------------------------+-------+ | id | HN | VisitDateTime | PDX | +------+------+----------------------------+-------+ | 1033 | 1 | 2016-05-01 12:12:00.000000 | E119 | | 1020 | 1 | 2016-02-28 12:43:00.000000 | E119 | | 1067 | 1 | 2016-11-29 12:37:00.000000 | J069 | | 1023 | 1 | 2016-07-23 12:47:00.000000 | J069 | | 1091 | 1 | 2015-09-25 12:37:00.000000 | J069 | | 1069 | 1 | 2016-08-17 12:01:00.000000 | K30 | | 1061 | 1 | 2015-05-26 12:31:00.000000 | K30 | | 1037 | 1 | 2016-09-07 12:25:00.000000 | U77 |
จะเห็นว่า อีตา HN=1 มารักษาหลายครั้งและบางครั้งที่มาก็ถูกวินิจฉัยด้วยโรคเดิม ๆ ที่เคยมา บางครั้งก็ไม่ซ้ำ แต่เราสนใจตัวที่ซ้ำหล่ะกัน ตามโจทย์ที่ว่า “Re-Visit โรค XX ภายใน YY ชั่วโมง/วัน นะ” วิธีการก็คือ เราจะใช้การ JOIN ตัวมันเองออกมาเพื่อหาความต่าง ส่วนฟังก์ชั่น TIMESTAMPDIFF ก็หาความต่างของสองช่วงเวลาในหน่วยที่กำหนด ลองหาอ่านเพิ่มเติมนะครับ 
SELECT
A.*,
V.*,
TIMESTAMPDIFF(DAY, A.VisitDateTime, V.VisitDateTime) AS DayOfReVisit
FROM Visit A
LEFT JOIN Visit V ON A.HN = V.HN AND A.PDX = V.PDX
WHERE A.VisitDateTime > V.VisitDateTime
ORDER BY A.HN;
SELECT
A.*,
V.*,
TIMESTAMPDIFF(DAY, A.VisitDateTime, V.VisitDateTime) AS DayOfReVisit
FROM Visit A
LEFT JOIN Visit V ON A.HN = V.HN AND A.PDX = V.PDX
WHERE A.VisitDateTime > V.VisitDateTime
ORDER BY A.HN;
SELECT
A.*,
V.*,
TIMESTAMPDIFF(DAY, A.VisitDateTime, V.VisitDateTime) AS DayOfReVisit
FROM Visit A
LEFT JOIN Visit V ON A.HN = V.HN AND A.PDX = V.PDX
WHERE A.VisitDateTime > V.VisitDateTime
ORDER BY A.HN;
ผลลัพธ์ก็จะประมาณนี้
นี่ก็แค่หนึ่งในหลาย ๆ วิธี ขอให้สนุกกับการดูข้อมูล ฮ่าาาาา
ปล. ไปรอฟังเพลงรักอยู่รอบกายด้วยกัน
