如何在 Postgresql 中使用逻辑运算符实现多个 if 子句

Question

我有 3 张表，我必须根据以下条件检查某些记录的计数。

IF

count(T1DM DX = 0) & COUNT (T2DM DX = 0) & COUNT (T2DM MEDS >= 1) & COUNT(ABC > 6.5 OR DEF > 11.1 OR GHI > 7) >= 1 THEN "CASE"

ELSE

DO NOTHING

**OR** 

IF

count(T1DM DX = 0) & COUNT (T2DM DX >=1) & COUNT (T1DM MEDS = 0) & COUNT (T2DM MEDS = 0) & COUNT(ABC > 6.5 OR DEF > 11.1 OR GHI > 7) >= 1 THEN "CASE"

ELSE

DO NOTHING

我的创建表语句如下

CREATE TABLE DX(
   DX_id  serial Primary Key
   person_id NOT NULL,
   condition_name VARCHAR (50) UNIQUE NOT NULL,
   cond_id VARCHAR (355) UNIQUE NOT NULL,
   condition_start_date TIMESTAMP NOT NULL,
   condition_end_date TIMESTAMP NOT NULL
);


CREATE TABLE RX(
   RX_id serial Primary Key
   person_id NOT NULL,
   presciption_name VARCHAR (50) UNIQUE NOT NULL,
   presc_id VARCHAR (355) UNIQUE NOT NULL,
   pres_start_date TIMESTAMP NOT NULL,
   pres_end_date TIMESTAMP 
);


CREATE TABLE Lab(
   Lab_id serial Primary Key
   person_id NOT NULL,
   Test_name VARCHAR (50) UNIQUE NOT NULL,
   Test_id VARCHAR (355) UNIQUE NOT NULL,
   Test_start_date TIMESTAMP NOT NULL,
   Test_value FLOAT
);

这是我尝试过的

IF ((select count(*) from public.DX where cond_id = 21) == 0 AND (select count(*) from public.DX where cond_id = 23) == 0 AND (select count(*) from public.RX where presc_id = 33) >=1
                                 AND (select count(*) from (select * from public.Lab where test_id in (41,42,43)) where test_value > 6.5)) THEN "FOUND"
ELSE
     DO NOTHING

但这会引发错误。谁能帮我实现多个 if 子句与它们之间的 AND/OR 逻辑运算符？

注意事项

1) DX 表可以有多个条件。根据流程图，我们需要寻找 T1DM 和 T2DM。我们可以使用 cond_ids (T1DM - 21, T2DM - 23) 来识别它们

2) RX 表可以有多个处方药。根据流程图，我们需要寻找 T1DM 药物和 T2DM 药物。我们可以使用 presc_ids (T1DM meds- 31, T2DM meds - 33) 识别它们

3) 实验室表可以有多个测量/测试结果。根据流程图，异常实验室定义为下列 3 种测量中的任何一种的阈值违规。

 a) Three measurements - ABC, DEF, GHI. Test_ids for these three are 41,42,43
 b) ABC > 6.5
 c) DEF > 11.1
 d) GHI > 7

Answer 1

您可以使用 CASE 表达式以及存在逻辑来编写此代码：

CASE WHEN
    NOT EXISTS (SELECT 1 FROM public.DX WHERE cond_id IN (21, 23)) AND
    EXISTS (SELECT 1 FROM public.DX WHERE presc_id = 33) AND
    EXISTS (SELECT 1 FROM public.Lab WHERE test_id IN (41,42,43) AND test_value > 6.5)
     THEN 'FOUND' END;