SQL Filter by Excluding Specific String - sql

Question

I am looking to run my query (below) by displaying latest value for "DATA_POINT_UPLOAD_DATA"."VALUE" , except 'READY'. Currently, it displays all 'READY' values, however, I want to do the opposite by displaying any values up to the time of execution except 'READY'.
Here is my current query:
select "DATA_POINT_UPLOAD_DATA"."LAST_UPDATED_TIMESTAMP" as "TIMESTAMP",
"DATA_POINT_UPLOAD_DATA"."VALUE" as "COMMENTS"
from "DB"."COMPONENT" "COMPONENT",
"DB"."COMPONENT_DATA_POINT" "COMPONENT_DATA_POINT",
"DB"."DATA_POINT_UPLOAD_DATA" "DATA_POINT_UPLOAD_DATA"
where "COMPONENT_DATA_POINT"."ID"="DATA_POINT_UPLOAD_DATA"."COMPONENT_DATA_POINT_ID"
and "COMPONENT"."ID"="COMPONENT_DATA_POINT"."COMPONENT_ID"
and "DATA_POINT_UPLOAD_DATA"."VALUE" ='READY'
and "DATA_POINT_UPLOAD_DATA"."LAST_UPDATED_TIMESTAMP" between ('01-JUN-17') and ('30-JUN-17')
and "COMPONENT_DATA_POINT"."NAME" ='StateOfItem'
and "COMPONENT"."SITE_ID" in('abc123');
Any help would be greatly appreciated.

Answer 1

In your WHERE clause you have this: "DATA_POINT_UPLOAD_DATA"."VALUE" ='READY'. That means you want to display the rows where DATA_POINT_UPLOAD_DATA has the value 'READY'.
Change your query and instead of using = try using != or <>.
SELECT "DATA_POINT_UPLOAD_DATA"."LAST_UPDATED_TIMESTAMP" AS "TIMESTAMP",
"DATA_POINT_UPLOAD_DATA"."VALUE" AS "COMMENTS"
FROM "DB"."COMPONENT" "COMPONENT",
"DB"."COMPONENT_DATA_POINT" "COMPONENT_DATA_POINT",
"DB"."DATA_POINT_UPLOAD_DATA" "DATA_POINT_UPLOAD_DATA"
WHERE "COMPONENT_DATA_POINT"."ID" ="DATA_POINT_UPLOAD_DATA"."COMPONENT_DATA_POINT_ID"
AND "COMPONENT"."ID" ="COMPONENT_DATA_POINT"."COMPONENT_ID"
AND "DATA_POINT_UPLOAD_DATA"."VALUE" !='READY'
AND "DATA_POINT_UPLOAD_DATA"."LAST_UPDATED_TIMESTAMP" BETWEEN ('01-JUN-17') AND ('30-JUN-17')
AND "COMPONENT_DATA_POINT"."NAME" ='StateOfItem'
AND "COMPONENT"."SITE_ID" IN('abc123');

Answer 2

You are asking for the latest record per VALUE now. You are only selecting VALUE and LAST_UPDATED_TIMESTAMP, however. So what you are asking is merely the maximum LAST_UPDATED_TIMESTAMP per VALUE. In SQL this translates to MAX(last_updated_timestamp) with GROUP BY value.
Select
max(last_updated_timestamp) as "timestamp",
value as comments
From db.data_point_upload_data
Where value <> 'READY'
and last_updated_timestamp between '2017-06-01' and '2017-06-30'
and cdp_id in
(
select id
from db.component_data_point
where name = 'StateOfItem'
and component_id in (select id from db.component where site_id = 'abc123')
)
Group by value;

Answer 3

Sorry to say, but that is a horrible query. Almost only upper case so as to minimize readability, table alias names that are no alias names, a join syntax that was made redundant twentyfive years ago, date string literals that only work in certain language settings, and unnecessary joins.
Then you select records with value = 'READY' and say that you want records that are not 'READY'. Well, then: WHERE NOT value = 'READY' or simply WHERE value <> 'READY'.
Here is the altered query:
Select
last_updated_timestamp as "timestamp",
value as comments
From db.data_point_upload_data
Where value <> 'READY'
and last_updated_timestamp between '2017-06-01' and '2017-06-30'
and cdp_id in
(
select id
from db.component_data_point
where name = 'StateOfItem'
and component_id in (select id from db.component where site_id = 'abc123')
);
If you only want to see the latest n rows, then order by last_updated_timestamp desc limit <n>.