[英]Oracle SQL Query to join multiple tables
I am trying to join multiple tables and the below query works well.我正在尝试加入多个表,下面的查询运行良好。
select
e.ENCNTR_ID e_id
, p.PERSON_ID p_id
, e.REG_DT_TM admitted
from
episode e
, patient p
where (e.reg_dt_tm > '01/JAN/2018'
and e.reg_dt_tm < '02/JAN/2018'
and e.active_ind = 1
and e.encntr_type_cd = 123.00
and e.ACTIVE_STATUS_CD = 1234
and e.person_id = p.person_id)
But when I change it and add more tables it gives me the error但是当我更改它并添加更多表时,它给了我错误
"SQL Command not properly ended" “SQL 命令未正确结束”
I need to add conditions on the first table(episode) as otherwise the query runs very slow.我需要在第一个表(剧集)上添加条件,否则查询运行速度非常慢。
select
e.ENCNTR_ID e_id
, p.PERSON_ID p_id
, e.REG_DT_TM admitted
, ce.EVENT_ID event_id
from
ENCOUNTER e
, person p
where (e.reg_dt_tm > '01/JAN/2018'
and e.reg_dt_tm < '02/JAN/2018'
and e.active_ind = 1
and e.encntr_type_cd = 7113.00
and e.ACTIVE_STATUS_CD = 22223
and e.person_id = p.person_id)
left join CLINICAL_EVENT ce on ce.ENCNTR_ID = e.ENCNTR_ID
and ce.EVENT_CD in (1235764
,22161234
)
and ce.valid_until_dt_tm > sysdate
left join CE_BLOB cb on ce.EVENT_ID = cb.EVENT_ID
and cb.valid_until_dt_tm > sysdate
order by e.REG_DT_TM, ce.PERFORMED_DT_TM, ce.CLINICAL_EVENT_ID
The query should look like this:查询应如下所示:
select e.ENCNTR_ID as e_id, p.PERSON_ID as p_id, e.REG_DT_TM as admitted, ce.EVENT_ID as event_id
from ENCOUNTER e join
person p
on e.person_id = p.person_id left join
CLINICAL_EVENT ce
on ce.ENCNTR_ID = e.ENCNTR_ID and
ce.EVENT_CD in (1235764, 22161234) and
ce.valid_until_dt_tm > sysdate left join
CE_BLOB cb
on ce.EVENT_ID = cb.EVENT_ID and
cb.valid_until_dt_tm > sysdate
where e.reg_dt_tm > date '2018-01-01' and
e.reg_dt_tm < date '2018-01-02' and
e.active_ind = 1 and
e.encntr_type_cd = 7113.00 and
e.ACTIVE_STATUS_CD = 22223
order by e.REG_DT_TM, ce.PERFORMED_DT_TM, ce.CLINICAL_EVENT_ID;
Notes:笔记:
FROM
clause.切勿在FROM
子句中使用逗号。 Always use proper, explicit, standard JOIN
syntax.始终使用正确、明确、标准的JOIN
语法。WHERE
clause goes after the FROM
clause. WHERE
子句在FROM
子句之后。JOIN
is an operator in the FROM
clause, so all JOIN
s need to be before the WHERE
. JOIN
是FROM
子句中的运算符,因此所有JOIN
需要在WHERE
之前。DATE
for date constants.对日期常量使用关键字DATE
。
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