带有subString的sql

Question

I have 2 fields in DB as follows:

table: t_doc_met
t_doc   t_num
PI  200923712291920BM
OI  200923712291920BM
OD  200923712301921OP
PD  200923712301921MO
MR  200923712301921F
BR  200923712305622BM
MR  200923712305622F
OB  200923712305622M1
OR  200923712305622D
MR  200923712314324M1
MR  200923712314324MO
BR  200923712314324BM
PI  200923712314325OP
OI  20092371231433MO

I want to pick all records in this table whose t_doc is in ('PD','OB','OD','OR','MR'). Also pick t_doc IN ('BR','PI','OI') whose t_num ends with 'BM'

select * from t_doc_met where 
t_doc IN ('PD','OB','OD','OR','MR') AND 
( t_doc IN ('BR','PI','OI') AND SUBSTR(t_num, LENGTH(t_num) - 1, 2) IN ('BM'))

Answer 1

You have an AND in place of OR :

SELECT *
FROM t_doc_met
WHERE
    (t_doc IN ('PD','OB','OD','OR','MR'))
    OR 
    (t_doc IN ('BR','PI','OI') AND SUBSTR(t_num, -2) IN ('BM'))

Note that Oracle's SUBSTR takes negative indexes to mean "start from the back". Hence I rewrote your

SUBSTR(t_num, LENGTH(t_num) - 1, 2) IN ('BM')

as

SUBSTR(t_num, -2) IN ('BM')

Answer 2

I am going to interpret the question as saying: You want all t_docs

• that do not end in bm
• that have a row with t_doc IN ('PD', 'OB', 'OD', 'OR', 'MR')
• that have a row with t_doc IN ('BR','PI','OI')

If this is correct:

select dm.t_num
from t_doc_met dm
where t_num LIKE '%BM'
group by t_num
having sum(case when t_doc IN ('PD', 'OB', 'OD', 'OR', 'MR') then 1 else 0 end) > 0 and
       sum(case when t_doc IN ('BR','PI','OI') then 1 else 0 end) > 0;

Alternatively, you might just want or :

select dm.t_num
from t_doc_met dm
where (t_doc IN ('PD', 'OB', 'OD', 'OR', 'MR')) or
      (t_num LIKE '%BM' and ('BR', 'PI', 'OI'));

Answer 3

You are looking for rows where t_doc is in 'PD','OB','OD','OR','MR'; and at the same time is in 'BR','PI','OI'. Those are mutually exclusive.

You appear to just want the first AND to be an OR :

select * from t_doc_met where 
t_doc IN ('PD','OB','OD','OR','MR') OR 
( t_doc IN ('BR','PI','OI') AND SUBSTR(t_num, -2) IN ('BM'));

T_ T_NUM            
-- -----------------
PI 200923712291920BM
OI 200923712291920BM
OD 200923712301921OP
PD 200923712301921MO
MR 200923712301921F 
BR 200923712305622BM
MR 200923712305622F 
OB 200923712305622M1
OR 200923712305622D 
MR 200923712314324M1
MR 200923712314324MO
BR 200923712314324BM

12 rows selected.

I've also simplified your substr's second argument, as dasblinkenlight mentioned you could do.

If this is part of a bigger query then you need to make sure that the conditions are enclosed in parentheses appropriately, so the parser can interpret the overall logic you intend:

select * from t_doc_met where 
-- some other conditions
AND (t_doc IN ('PD','OB','OD','OR','MR') OR 
  (t_doc IN ('BR','PI','OI') AND SUBSTR(t_num, -2) IN ('BM')));

Answer 4

I have created the sample database for you with same data records that you have provided.

Table:

Hope this query helps you, modify the "AND/OR" based on your requirements.

SELECT * FROM categories WHERE categoryName in  ('PD','OB','OD','OR','MR')  OR (categoryName in ('BR','PI','OI') and description like '%BM' )

I have used OR condition to get both the record set of t_doc is in ('PD','OB','OD','OR','MR'). Also pick t_doc IN ('BR','PI','OI') whose t_num ends with 'BM'

Note: I have modified the Table Name and column names