I have this statement in my Access database:
It lists Magazzino.Codice from 2 tables and the relating quantities.
SELECT Magazzino.Codice, Magazzino.Qnt
FROM Magazzino
WHERE (((Magazzino.[Prossimo_arrivo]) Is Null) And ((Magazzino.Qnt)<30) And ((Magazzino.[Fascia_I])=True));
UNION ALL --Joins allowing duplicates
SELECT Magazzino.Codice, Magazzino.Qnt
FROM Magazzino
WHERE (((Magazzino.[Prossimo_arrivo]) Is Null) And ((Magazzino.Qnt)<10) And ((Magazzino.[Fascia_II])=True));
I wish to add a statement avoiding to list Magazzino.Codice if the same ID is present on a third table Magazzino Grezzi.
How can I get this?
First, simplify the logic assuming you don't want duplicates form this table:
SELECT m.Codice, m.Qnt
FROM Magazzino as m
WHERE m.[Prossimo_arrivo]) Is Null AND
( (m.Qnt < 30 AND m.[Fascia_I] = True) OR
(m.Qnt < 10 AND m.[Fascia_II] = False) OR
)
Then use IN or EXISTS:
SELECT m.Codice, m.Qnt
FROM Magazzino as m
WHERE m.[Prossimo_arrivo]) Is Null AND
( (m.Qnt < 30 AND m.[Fascia_I] = True) OR
(m.Qnt < 10 AND m.[Fascia_II] = False) OR
) AND
NOT EXISTS (SELECT 1
FROM Magazzino_Grezzi as mg
WHERE mg.Codice = m.Codice
);
If you really want some rows to be duplicated (those that meet both conditions), then you can add the NOT EXISTS clause to both your subqueries.
Related
SELECT DISTINCT
Member_ID,
CASE
WHEN a.ASTHMA_MBR = 1 THEN 'ASTHMA'
WHEN a.COPD_MBR = 1 THEN 'COPD'
WHEN a.HYPERTENSION_MBR = 1 THEN 'HYPERTENSION'
END AS DX_FLAG
So a member may have more than one, but my statement is only returning one of them.
I'm using Teradata and trying to convert multiple columns of boolean data into one column. The statement is only returning one condition when members may have 2 or more. I tried using Select instead of Select Distinct and it made no difference.
This is a kind of UNPIVOT:
with base_data as
( -- select the columns you want to unpivot
select
member_id
,date_col
-- the aliases will be the final column value
,ASTHMA_MBR AS ASTHMA
,COPD_MBR AS COPD
,HYPERTENSION_MBR AS HYPERTENSION
from your_table
)
,unpvt as
(
select member_id, date_col, x, DX_FLAG
from base_data
-- now unpivot those columns into rows
UNPIVOT(x FOR DX_FLAG IN (ASTHMA, COPD, HYPERTENSION)
) dt
)
select member_id, DX_FLAG, date_col
from unpvt
-- only show rows where the condition is true
where x = 1
I have 3 tables:
/test/table1:
Columns: doc_id, anotherID, value1
/test/table2:
Columns: anotherID, value1
/test/table3
Columns: doc_id, value2
I want to select the data of /test/table1 with 2 conditions. One condition in /test/table2 and another one in /test/table3.
So I select my data in one table with one condition like that:
SELECT doc_id, anotherID FROM /test/table1 AS d
INTO CORRESPONDING FIELDS OF TABLE #ct_document
WHERE EXISTS ( SELECT * FROM /test/table2 AS a
WHERE value1 < #iv_value1 AND a~value1 = d~value1_id ).
It selects the content as I expect. But now I want to add a condition, to only select this data but only where /test/table3~value2 = 2.
To do that, I do:
SELECT doc_id, anotherID FROM /test/table1 AS d
INTO CORRESPONDING FIELDS OF TABLE #ct_document
WHERE EXISTS ( SELECT * FROM /test/table2 AS a
WHERE value1 < #iv_value1 AND a~value1 = d~value1_id )
AND EXISTS ( SELECT * FROM /test/table3 AS e
WHERE e~value2 = 2 ).
When I do that, I have the same content as before... It doesn't take my second condition.
What don't I understand ?
The condition EXISTS ( SELECT * FROM /test/table3 AS e WHERE e~value2 = 2 ) is always evaluated to TRUE if there's at least one line in /test/table3 with e~value2 = 2, whatever the content of the table /test/table1.
To make it evaluated to TRUE or FALSE according to /test/table1 (alias d), you should add the condition AND e~doc_id = d~doc_id, like this:
...
AND EXISTS ( SELECT * FROM /test/table3 AS e
WHERE e~value2 = 2 AND e~doc_id = d~doc_id ).
I have two tables, headers and lines. I need to grab the batch_submission_date from the header table, but sometimes a query for batch_id will return a null for batch_submission_date, but will also return a parent_batch_id, and if we query THAT parent_batch_id as a batch_id, it will then return the correct batch_submission_date.
e.g.
SELECT t1.batch_id,
t1.parent_batch_id,
t2.batch_submission_date
FROM db.headers t1, db.lines t2
WHERE t1.batch_id = '12345';
output = 12345, 99999, null
Then we use that parent batch_id as a batch_id :
SELECT t1.batch_id,
t1.parent_batch_id,
t2.batch_submission_date
FROM db.headers t1, db.lines t2
WHERE t1.batch_id = '99999';
and we get output = 99999,99999,'2018-01-01'
So I'm trying to write a query that will do this for me - anytime a batch_id's batch_submission_date is null, we find that batch_id's parent batch_id and query that instead.
This was my idea - but I just get back null both for bp_batch_submission_date and for new_submission_date.
SELECT
t1.parent_id as parent_id,
t1.BATCH_ID as bp_batch_id,
t2.BATCH_LINE_NUMBER as bp_batch_li,
t1.BATCH_SUBMISSION_DATE as bp_batch_submission_date,
CASE
WHEN t1.BATCH_SUBMISSION_DATE is null
THEN
(SELECT a.BATCH_SUBMISSION_DATE
FROM
db.headers a,
db.lines b
WHERE
a.SD_BATCH_HEADERS_SKEY = b.SD_BATCH_HEADERS_SKEY
and a.parent_batch_id = bp_batch_id
and b.batch_line_number = bp_batch_li
) END as new_submission_date
FROM
db.headers t1,
db.lines t2
WHERE
t1.SD_BATCH_HEADERS_SKEY = t2.SD_BATCH_HEADERS_SKEY
and (t1.BATCH_ID = '12345' or t1.PARENT_BATCH_ID = '12345')
and t2.BATCH_LINE_NUMBER = '1'
GROUP BY
t2.BATCH_CLAIM_LINE_STATUS_DESC,
t1.PARENT_BATCH_ID,
t1.BATCH_ID,
t2.BATCH_LINE_NUMBER,
t1.BATCH_SUBMISSION_DATE;
is what I'm trying to do possible? using the bp_batch_id and bp_batch_li variables
Use CTE (common table expression) to avoid redundant code, then use coalesce() to find parent date in case of null. In your first queries you didn't attach joining condition between two tables, I assumed it's based on sd_batch_headers_skey like in last query.
dbfiddle demo
with t as (
select h.batch_id, h.parent_batch_id, l.batch_submission_date bs_date
from headers h
join lines l on l.sd_batch_headers_skey = h.sd_batch_headers_skey
and l.batch_line_number = '1' )
select batch_id, parent_batch_id,
coalesce(bs_date, (select bs_date from t x where x.batch_id = t.parent_batch_id)) bs_date
from t
where batch_id = 12345;
You could use simpler syntax with connect by and level <= 2 but if in your data there are really rows containing same ids (99999, 99999) then we get cycle error.
I use complex CASE WHEN for selecting values. I would like to use this result in WHERE clause, but Postgres says column 'd' does not exists.
SELECT id, name, case when complex_with_subqueries_and_multiple_when END AS d
FROM table t WHERE d IS NOT NULL
LIMIT 100, OFFSET 100;
Then I thought I can use it like this:
select * from (
SELECT id, name, case when complex_with_subqueries_and_multiple_when END AS d
FROM table t
LIMIT 100, OFFSET 100) t
WHERE d IS NOT NULL;
But now I am not getting a 100 rows as result. Probably (I am not sure) I could use LIMIT and OFFSET outside select case statement (where WHERE statement is), but I think (I am not sure why) this would be a performance hit.
Case returns array or null. What is the best/fastest way to exclude some rows if result of case statement is null? I need 100 rows (or less if not exists - of course). I am using Postgres 9.4.
Edited:
SELECT count(*) OVER() AS count, t.id, t.size, t.price, t.location, t.user_id, p.city, t.price_type, ht.value as houses_type_value, ST_X(t.coordinates) as x, ST_Y(t.coordinates) AS y,
CASE WHEN t.classification='public' THEN
ARRAY[(SELECT i.filename FROM table_images i WHERE i.table_id=t.id ORDER BY i.weight ASC LIMIT 1), t.description]
WHEN t.classification='protected' THEN
ARRAY[(SELECT i.filename FROM table_images i WHERE i.table_id=t.id ORDER BY i.weight ASC LIMIT 1), t.description]
WHEN t.id IN (SELECT rl.table_id FROM table_private_list rl WHERE rl.owner_id=t.user_id AND rl.user_id=41026) THEN
ARRAY[(SELECT i.filename FROM table_images i WHERE i.table_id=t.id ORDER BY i.weight ASC LIMIT 1), t.description]
ELSE null
END AS main_image_description
FROM table t LEFT JOIN table_modes m ON m.id = t.mode_id
LEFT JOIN table_types y ON y.id = t.type_id
LEFT JOIN post_codes p ON p.id = t.post_code_id
LEFT JOIN table_houses_types ht on ht.id = t.houses_type_id
WHERE datetime_sold IS NULL AND datetime_deleted IS NULL AND t.published=true AND coordinates IS NOT NULL AND coordinates && ST_MakeEnvelope(17.831490030182, 44.404640972306, 12.151558389557, 47.837396630872) AND main_image_description IS NOT NULL
GROUP BY t.id, m.value, y.value, p.city, ht.value ORDER BY t.id LIMIT 100 OFFSET 0
To use the CASE WHEN result in the WHERE clause you need to wrap it up in a subquery like you did, or in a view.
SELECT * FROM (
SELECT id, name, CASE
WHEN name = 'foo' THEN true
WHEN name = 'bar' THEN false
ELSE NULL
END AS c
FROM case_in_where
) t WHERE c IS NOT NULL
With a table containing 1, 'foo', 2, 'bar', 3, 'baz' this will return records 1 & 2. I don't know how long this SQL Fiddle will persist, but here is an example: http://sqlfiddle.com/#!15/1d3b4/3 . Also see https://stackoverflow.com/a/7950920/101151
Your limit is returning less than 100 rows if those 100 rows starting at offset 100 contain records for which d evaluates to NULL. I don't know how to limit the subselect without including your limiting logic (your case statements) re-written to work inside the where clause.
WHERE ... AND (
t.classification='public' OR t.classification='protected'
OR t.id IN (SELECT rl.table_id ... rl.user_id=41026))
The way you write it will be different and it may be annoying to keep the CASE logic in sync with the WHERE limiting statements, but it would allow your limits to work only on matching data.
I have a sql query that I run against a sql server database eg.
SELECT * FROM MyTable WHERE Id = 2
This may return a number of records or may return none. If it returns none, I would like to alter my sql query to return a default record, is this possible and if so, how? If records are returned, the default record should not be returned. I cannot update the data so will need to alter the sql query for this.
Another way (you would get an empty initial rowset returned);
SELECT * FROM MyTable WHERE Id = 2
IF (##ROWCOUNT = 0)
SELECT ...
SELECT TOP 1 * FROM (
SELECT ID,1 as Flag FROM MyTable WHERE Id = 2
UNION ALL
SELECT 1,2
) qry
ORDER BY qry.Flag ASC
You can have a look to this post. It is similar to what you are asking
Return a value if no rows are found SQL
I hope that it can guide you to the correct path.
if not exists (SELECT top 1 * FROM mytable WHERE id = 2)
select * from mytable where id= 'whatever_the_default_id_is'
else
select * from mytable where id = 2
If you have to return whole rows of data (and not just a single column) and you have to create a single SQL query then do this:
Left join actual table to defaults single-row table
select
coalesce(a.col1, d.col1) as col1,
coalesce(a.col2, d.col2) as col2,
...
from (
-- your defaults record
select
default1 as col1,
default2 as col2,
...) as d
left join actual as a
on ((1 = 1) /* or any actual table "where" conditions */)
The query need to return the same number of fields, so you shouldn't do a SELECT * FROM but a SELECT value FROM if you want to return a default value.
With that in mind
SELECT value FROM MyTable WHERE Id = 2
UNION
SELECT CASE (SELECT count(*) FROM MyTable WHERE Id = 2)
WHEN 0 THEN 'defaultvalue'
END