I have a SQL Server 2005 database that is used for transferring data, in this database we have 30-40 views.
I need to report all the columns that are exposed by these views.
Is there a way to query all the views in the db and output those columns?
Thanks
SELECT
[schema] = s.name,
[view] = v.name,
[column] = c.name
FROM sys.views AS v
INNER JOIN sys.schemas AS s
ON v.[schema_id] = s.[schema_id]
INNER JOIN sys.columns AS c
ON v.[object_id] = c.[object_id]
ORDER BY [schema],[view],c.column_id;
Related
I have a working PostgreSQL query, but it is taking a considerable amount of time to execute. I need help optimising it.
I have:
Removed inner queries as much as possible.
Removed the unnecessary data from the query.
Created a with query which gets the required data from the beginning
I need help to optimise this query
with data as (
select
e.id,
e.name,
t.barcode,
tt.variant,
t.cost_cents::decimal / 100 as ticket_cost,
t.fee_cents::decimal / 100 as booking_fee
from
tickets t
inner join events e on t.event_id = e.id
inner join ticket_types tt on t.ticket_type_id = tt.id
where
t.status = 2
and e.source in ('source1', 'source2')
)
select
d.name,
count(distinct d.barcode) as issued,
(select count(distinct d2.barcode) from data d2 where d2.id = d.id and d2.variant is null) as sold,
sum(d.ticket_cost) as ticket_revenue,
sum(d.booking_fee) as booking_fees
from
data d
group by
id,
name
Better to detect slow parts with using EXPLAIN .
It will show cost of all parts
You can speed up joins by creating proper indexes.
Also, remove the subquery
(select count(distinct d2.barcode) from data d2 where d2.id = d.id and d2.variant is null)
from the SELECT clause and add a join to d2 table something like this:
select
d.name,
count(distinct d.barcode) as issued,
count(distinct d2.barcode) as sold,
sum(d.ticket_cost) as ticket_revenue,
sum(d.booking_fee) as booking_fees
from
data d
left join data d2 on (d2.id = d.id and d2.variant is null)
group by
d.id,
d.name
My query is working but it takes time to display the data. Can you help me to make it quick.
$sql="SELECT allinvty3.*, stock_transfer_tb.* from stock_transfer_tb
INNER JOIN allinvty3 on stock_transfer_tb.in_code = allinvty3.in_code
where stock_transfer_tb.in_code NOT IN (SELECT barcode.itemcode from barcode where stock_transfer_tb.refnumber = barcode.refitem)";
I would recommend using the following query:
SELECT
a.*,
s.*
FROM stock_transfer_tb s
INNER JOIN allinvty3 a
ON s.in_code = a.in_code
WHERE
NOT EXISTS (SELECT 1 FROM barcode b
WHERE s.refnumber = b.refitem AND s.in_code = b.itemcode);
If this still doesn't give you the performance you want, then you should look into adding indices on all columns involved in the join and where clause.
I have three entities: Group, Activity, and Comment. Each entity is represented in the db as a table. A Group has many Activities, and an Activity has many comments. Each entity has a CreatedDate field. I need to query for all groups + the CreatedDate of the most recent entity created on that Group's object graph.
I've constructed a sql query that gives me what I need, but I'm not sure how to do this in entity framework. Specifically this line: (SELECT MAX(X)
FROM (VALUES (g.CreatedDate), (a.CreatedDate), (c.CreatedDate)) Thanks in advance for your help. Here's the full query:
WITH GroupWithLastActivityDate AS (
SELECT DISTINCT
g.Id
,g.GroupName
,g.GroupDescription
,g.CreatedDate
,g.ApartmentComplexId
,(SELECT MAX(X)
FROM (VALUES (g.CreatedDate), (a.CreatedDate), (c.CreatedDate)) AS AllDates(X)) AS LastActivityDate
FROM Groups g
LEFT OUTER JOIN Activities a
on g.Id = a.GroupId
LEFT OUTER JOIN Comments c
on a.Id = c.ActivityId
WHERE g.IsActive = 1
)
SELECT
GroupId = g.Id
,g.GroupName
,g.GroupDescription
,g.ApartmentComplexId
,NumberOfActivities = COUNT(DISTINCT a.Id)
,g.CreatedDate
,LastActivityDate = Max(g.LastActivityDate)
FROM GroupWithLastActivityDate g
INNER JOIN Activities a
on g.Id = a.GroupId
WHERE a.IsActive = 1
GROUP BY g.Id
,g.GroupName
,g.GroupDescription
,g.CreatedDate
,g.ApartmentComplexId
I should add that for now I've constructed a view with this query (plus some other stuff) which I'm querying with a SqlQuery.
I manage to do the selection with more selects and a loop. 4 tables ( the last one was just for collecting all the data )
But now i'm thinking of a way to select all the fields i need with just one select statement. Here is the huge select :)
SELECT vbak~vbeln vbak~audat
tvakt~bezei
vbap~posnr vbap~matnr vbap~kwmeng vbap~vrkme
lips~vbeln lips~posnr lips~werks lips~lfimg
vbfa~vbtyp_n
FROM vbak JOIN vbap ON vbak~vbeln = vbap~vbeln
JOIN tvakt ON vbak~auart = tvakt~auart
LEFT JOIN vbfa ON vbfa~vbelv = vbak~vbeln AND vbfa~posnv = vbap~posnr
JOIN lips ON vbfa~vbeln = lips~vbeln AND vbfa~posnn = lips~posnr
INTO TABLE gt_salord
WHERE tvakt~spras = 'EN' AND
vbak~vbeln IN s_vbeln AND
vbak~audat IN s_audat.
The problem is this doesn't work. When i try to activate it throws this error: " Unable to compare with "VBAP~POSNR". A table can be joined with a maximum of one other table using LEFT OUTER JOIN "
If i don't use LEFT JOIN and only JOIN it works but i don't get all what i want. I need to get all the SALES ORDERS even if they don't have a DELIVERY ORDER assigned. Is there a way to do that, or do i really have to split my select?
I have noticed in SAP that it's more efficient to simplify select statements and proceed with LOOP and SELECT SINGLE for table that do not participate in data selection.
In your case data from table VBFA could be fetch after data selection (it is not restricting the amount of data fetched from the DB).
Of course it depends on indexes, application server buffering... but, even though it might be counter-intuitive for SQL experts, keeping select statements not too complex in SAP is best.
Can you try the following selection:
SELECT vbak~vbeln vbak~audat
tvakt~bezei
vbap~posnr vbap~matnr vbap~kwmeng vbap~vrkme
lips~vbeln lips~posnr lips~werks lips~lfimg
vbfa~vbtyp_n
FROM vbak JOIN vbap ON vbak~vbeln = vbap~vbeln
JOIN tvakt ON vbak~auart = tvakt~auart
LEFT JOIN vbfa ON vbfa~vbelv = vbap~vbeln AND vbfa~posnv = vbap~posnr
JOIN lips ON vbfa~vbeln = lips~vbeln AND vbfa~posnn = lips~posnr
INTO TABLE gt_salord
WHERE tvakt~spras = 'EN' AND
vbak~vbeln IN s_vbeln AND
vbak~audat IN s_audat.
I can't test the result, but the syntax check say: ok.
There is only one tiny difference:
x---- difference
v
LEFT JOIN vbfa ON vbfa~vbelv = vbap~vbeln AND vbfa~posnv = vbap~posnr
LEFT JOIN vbfa ON vbfa~vbelv = vbak~vbeln AND vbfa~posnv = vbap~posnr
You compared vbfa~vbelv with vbak~vbeln, I do it with vbap~vbeln. Both have the same value, but in the on-clause you use again vbap.
I dont know about SAP Abap . But from SQL point of view you can use derived query if it is supported in SAP.
here is some approach :
select * from
(
select * from
table1 inner join table2 on table1.key=table2.key
inner join table3 on table1.key=table3.key
) a left outer join table4 b
on a.key=b.key
Posting this as the question is tagged as SQL. Hope it works
Try to change the order of table fields in the on clause of left join. Put vbap~vbeln = vbfa~vbelv
I am new to Entity framwork and currently trying hard to get used this programming paradigm. I have this query which i want to write in Entity SQL.
SELECT f.id, f.personName, c.Category, j.busCode, s.description, f.StartDate, (SELECT COUNT(*) FROM Analysis WHERE id = f.id) As numOfAnalysis
FROM forms f
INNER JOIN Jobs j ON f.id = j.id
INNER JOIN category c ON j.categoryid = c.categoryid
INNER JOIN stage s ON f.stageid = s.stageid
WHERE j.busCode NOT IN ('xyz', 'YYY')
ORDER BY startDate
I can get records from two tables but as soon as i add third table using the navigation property, i get error table category is not loaded in the current context. I am using .net 3.5. Keep in mind that EDM V2 doest not have foreign keys and i think the only way to traverse through the table relationship is navigation property.
Any help will be deeply appreciated.
Thanks
Coder74
If you use should be able to mount this Linq query.
I tried to put together, but in the rush and no such test is complicated.
You can use this reference as support: http://code.msdn.microsoft.com/101-LINQ-Samples-3fb9811b
var result = (from f in forms
join j in Jobs on f.id equals j.id
join c in Category on j.categoryid equals c.categoryid
join s in stage on f.stageid equals s.stageid
join a in Analysis on a.id equals f.id
where !(new int[] { 'xyz', 'YYY' }).Contains(j.busCode)
orderby f.StartDate
select {
id =f.id,
personName = f.personName,
Category = c.Category,
busCode = j.busCode,
description = s.description,
StartDate = f.StartDate,
numOfAnalysis = a.Count()
}).ToList()
Julio Spader
W&S Soluções de Internet