连接具有不同条件的同一张表的列-SQL

Question

I am able to query with one condition ( as shown in image below ) but when i query with couple of criterias and trying to create two same columns of same table with different criteria, i get no result. 2nd Image is the expected result which i am not able to retrieve. Any inputs are highly appreciated. Thanks.

select save_line from save_output_table  
where execution_id in ('292') 
  and seq_id = '0' 
  and save_type='R' 
order by line_id ASC

+------------+
| Save_line  |
+------------+
|         17 |
|         22 |
|         23 |
+------------+



SELECT 
( select save_line 
  from save_output_table
  where execution_id in ('292') 
    and seq_id = '0' 
    and save_type='R' 
    order by line_id ASC 
) as save_line1,
( select save_line 
  from save_output_table  
  where execution_id in ('286') 
    and seq_id = '0' 
    and save_type='R' 
    order by line_id ASC 
) as save_line2
from save_output_table 

 +-------------+------------+
 | Save_line 1 | Save_line2 |
 +-------------+------------+
 |          17 |          9 |
 |          22 |          5 |
 |          23 |          3 |
 +-------------+------------+

Sample Data :

 +---------------+--------+-----------+---------+-----------+
 | execution_id  | seq_id | save_type | line_id | save_line |
 +---------------+--------+-----------+---------+-----------+
 |           286 |      0 | R         |       1 |        17 |
 |           286 |      0 | R         |       2 |        22 |
 |           286 |      0 | R         |       3 |        23 |
 |           286 |      0 | D         |       1 |        17 |
 |           286 |      0 | D         |       2 |        22 |
 |           286 |      0 | D         |       3 |        23 |
 |           292 |      0 | R         |       1 |         9 |
 |           292 |      0 | R         |       2 |         5 |
 |           292 |      0 | R         |       3 |         3 |
 |           292 |      0 | D         |       1 |        98 |
 |           292 |      0 | D         |       2 |       622 |
 |           292 |      0 | D         |       3 |       273 |
 +---------------+--------+-----------+---------+-----------+

Answer 1

So if you want lists of save_line in order by line_id, in different columns according to save_type and execution_id, you need to pivot. There are a few different ways you can do this. Here are a couple that should work no matter what flavor of SQL you are using:

SELECT line_id, 
max(CASE WHEN execution_id = '292' and save_type = 'R' then save_line end) R_292,
max(CASE WHEN execution_id = '286' and save_type = 'R' then save_line end) R_286
FROM save_output_table
GROUP BY line_id

or

SELECT t1.save_line save_line1,
t2.save_line save_line2
FROM 
    (SELECT *
    FROM save_output_table
    WHERE save_type = 'R'
    and execution_id = '292'
    ) t1

JOIN (SELECT *
    FROM save_output_table
    WHERE save_type = 'R'
    and execution_id = '286'
    ) t2
ON t1.line_id = t2.line_id

Note: for the second option, the join only gives complete lists if there are the same number of line_ids for each condition. If there aren't, you should change it to a FULL OUTER JOIN, which wouldn't work in MySQL and possibly others.