SQL tip: Create a query for hourly reporting

To create a query that can report hourly, first create a table. The table has a record date, no time information, and another record hour. The following table has one column that records different processing types. For example, we can find the total number of processing types by the hour.
CREATE TABLE Test
(StartTime DATETIME not NULL
DEFAULT Current_timestamp,
StartDate DATETIME not NULL
DEFAULT Convert (DATETIME, convert (CHAR, Current_timestamp, 110)),
Starthour INT not NULL
DEFAULT DATEPART (Hh,current_timestamp),
Trantype INT not NULL
CONSTRAINT Ck_trantype CHECK (Trantype in
(
1,--insert
2,--Update
3,--delete
)
DEFAULT 1
)
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Next, insert the test data to simulate a possible sample.
INSERT Test (StartTime, Trantype) VALUES (Current_timestamp, 3)
INSERT Test (StartTime, Trantype) VALUES (Current_timestamp, 2)
INSERT Test (StartTime, Trantype) VALUES (Current_timestamp, 3)
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DECLARE @hr int
SET @hr = DATEPART (hh, DATEADD (Hh,-1,current_timestamp))
INSERT Test (StartTime, Trantype, Starthour) _
VALUES (DATEADD (Hh,-1,current_timestamp), 3, @hr)
INSERT Test (StartTime, Trantype, Starthour) _
VALUES (DATEADD (Hh,-1,current_timestamp), 1, @hr)
INSERT Test (StartTime, Trantype, Starthour) _
VALUES (DATEADD (Hh,-1,current_timestamp), 2, @hr)
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Then use a query to find out the total number of days and hours of processing.
SELECT StartDate Tran_day,
Starthour Tran_hour
, Case Trantype when 1 THEN ' Insert '
When 2 THEN ' Update '
When 3 THEN ' delete '
ELSE ' Unknown '
End Trantype,
COUNT (*) tran_total
From
Test
GROUP by
StartDate,
Starthour
, Trantype
Order by StartDate, Starthour
COMPUTE SUM (COUNT (*)) by StartDate, Starthour
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Remove test to empty the test table.
DROP TABLE Test
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