Get a count of all tables and Views in the database - sql-server

Question

I'm trying to write a query to get a count of all the tables and views and a sum of the two
Here is what i have so far:
Select
SCHEMA_NAME(schema_id) SchemaName,
type,
COUNT(*) TablesPerSchema,
COUNT(*) ViewsPerSchema,
'sum of tables and views' Total
From
Sys.objects
Where
type = 'U' or type = 'V'
Group By
SCHEMA_NAME(schema_id), type
Order By
Type, SchemaName
This works somewhat but I need to see the TablesPerSchema and ViewsPerSchema side by side. Right now it just showing Count(*) in each column.

Answer 1

Essentially, you are asking how to pivot your results so that per-type aggregates appear as columns. This can be done with the PIVOT operator:
select SchemaName,
ISNULL([U],0) as TablesPerSchema,
ISNULL([V],0) as ViewsPerSchema,
ISNULL([U],0) + ISNULL([V],0) As Total
From
(
select SCHEMA_NAME(schema_id) SchemaName,type,count(*) as TypeCount
from Sys.objects
Where type in ( 'U','V' )
group by SCHEMA_NAME(schema_id),type) T
PIVOT (
sum(TypeCount)
for [type] in ( [U],[V] )
) as pvt
The result will look like this:
SchemaName TablesPerSchema ViewsPerSchema Total
------------ --------------- -------------- -----------
dbo 46 117 163
GDS 0 3 3
IATA 3 10 13
Integration 2 4 6
Merchant 0 8 8
Portal 2 0 2
Reports 2 0 2
The PIVOT operator essentially means that for each type in the type list:
`for [type] in ( [U],[V] )`
the aggregate sum(TypeCount) will be calculated and placed in a new column with the same name as the type, ie V and U

Answer 2

use AdventureWorks2014
;with cte as
(
select
isnull(t.SchemaName, v.SchemaName) as SchemaName,
isnull(t.TablesPerSchema, 0) as TablesPerSchema,
isnull(v.ViewsPerSchema, 0) as ViewsPerSchema,
(isnull(t.TablesPerSchema, 0) + isnull(v.ViewsPerSchema, 0)) as 'Total'
from
(
Select
SCHEMA_NAME(schema_id) SchemaName,
type,
COUNT(*) TablesPerSchema
from
Sys.objects
Where
type = 'U'
Group By
SCHEMA_NAME(schema_id), type
) as t
full outer join
(
Select
SCHEMA_NAME(schema_id) SchemaName,
type,
COUNT(*) ViewsPerSchema
From
Sys.objects
Where
type = 'V'
Group By
SCHEMA_NAME(schema_id), type
) as v
on t.SchemaName = v.SchemaName
) select * from cte order by SchemaName
Result
SchemaName TablesPerSchema ViewsPerSchema Total
------------------------------- -------------- -----------
dbo 3 0 3
HumanResources 6 6 12
Person 13 2 15
Production 25 3 28
Purchasing 5 2 7
Sales 19 7 26
(6 row(s) affected)
Here is the logic
Select the tables from sys.objects.
Select the views from sys.objects.
Then full outer join the results of the two selects on schema name. The full outer join ensures that the if the schema does not have tables but has views or vice versa is still include in the final results.
Then use isnull() to get schema names from one of the result sets and to replace nulls with zeros.
Finally use Common Expression table to sort the results by schemaname.
In your question, you have included type in the select columns, however, for each row since you expect # of views and # of tables, having only one type column does not make sense, so I haven't kept it in my answer. Also the TablesPerSchema and ViewsPerSchema anyways indicate what type of object they are representing.