How can I do the following SQL query using SQLAlchemy?
SELECT COUNT (*)
FROM det_factura
WHERE company = 31
AND date::text LIKE '2011-05% ';
If det_factura is also a mapped object, then this query should do it:
qry = (session.query(func.count(det_factura.id))
.filter(det_factura.company==31)
.filter(det_factura.date.like('2010-05%'))
)
If it is a table instance, the one below should work:
qry = select([func.count(det_factura.id)],
and_(det_factura.company==31,
det_factura.date.like('2010-05%')
)
)
Related
I have the following query
select
max(sample) as s
, (select result_n from result r where r.sample = s)
, result_description
from result
group by result_description
Is it possible to feed the result of the aggregate in to the sub query as shown
This should work:
select max(r.sample) as s,
(select r2.result_n
from result r2
where r2.sample = max(r.sample)
),
r.result_description
from result r
group by r.result_description
I have one sql that need convert string column to array and i have to filter with this column，sql like this：
select
parent_line,
string_to_array(parent_line, '-')
from
bx_crm.department
where
status = 0 and
'851' = ANY(string_to_array(parent_line, '-')) and
array_length(string_to_array(parent_line, '-'), 1) = 5;
parent_line is a varchar(50) column，the data in this like 0-1-851-88
question:
string_to_array(parent_line, '-') appear many times in my sql.
how many times string_to_array(parent_line) calculate in each row. one time or three times
how convert string_to_array(parent_line) to a parameter. at last,my sql may like this:
depts = string_to_array(parent_line, '-')
select
parent_line,
depts
from
bx_crm.department
where
status = 0 and
'851' = ANY(depts) and
array_length(depts, 1) = 5;
Postgres supports lateral joins which can simplify this logic:
select parent_line, v.parents, status, ... other columns ...
from bx_crm.department d cross join lateral
(values (string_to_array(parent_line, '-')) v(parents)
where d.status = 0 and
cardinality(v.parents) = 5
'851' = any(v.parents)
Use a derived table:
select *
from (
select parent_line,
string_to_array(parent_line, '-') as parents,
status,
... other columns ...
from bx_crm.department
) x
where status = 0
and cardinality(parents) = 5
and '851' = any(parents)
My table looks something like this:
I want to retrieve all the PractitionerIdFK if they have SpecialityIdFK = 1 AND SpecialityIdFK= 2. I tried the following but it doesn't seem to work.
SELECT PractitionerSpecialities.PractitionerIdFK
FROM PractitionerSpecialities
WHERE PractitionerSpecialities.SpecialityIdFK IN (
SELECT PractitionerSpecialities.SpecialityIdFK
FROM PractitionerSpecialities
WHERE PractitionerSpecialities.SpecialityIdFK = 1
AND PractitionerSpecialities.SpecialityIdFK = 2
)
You can use GROUP BY and HAVING:
SELECT ps.PractitionerIdFK
FROM PractitionerSpecialities ps
WHERE ps.SpecialityIdFK IN (1, 2)
GROUP BY ps.PractitionerIdFK
HAVING COUNT(*) = 2; -- the size of the comparison list
This assumes that there are no duplicates in PractitionerSpecialities. If that is a possibility, then use HAVING COUNT(DISTINCT ps.SpecialityIdFK) = 2.
It can be achieved by using IN and BETWEEN operator in SQL .
SELECT PractitionerSpecialities.PractitionerIdFK
FROM PractitionerSpecialities
WHERE PractitionerSpecialities.SpecialityIdFK in (1,2)
-- You can BETWEEN Clause as well ..
SELECT PractitionerSpecialities.PractitionerIdFK
FROM PractitionerSpecialities
WHERE PractitionerSpecialities.SpecialityIdFK BETWEEN 1 AND 2
In Sub query use OR operator instead of AND .
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
I have the following SQL:
SELECT
*,
(SELECT COUNT(*) FROM WebOrder_URLHistory WHERE WebOrder_URLHistory.LeadID = Leads.LeadID) AS Sales
FROM
Leads
I want to put it (the select count statement) in this LINQ statement so I can get the sales count in my linq statement:
Dim TheLeads = (From L In DB.Leads Where L.IsDeleted = False Select L).ToList()
Is this possible to do in LINQ?
You can write Select L, L.UrlHistory.Count()