Select and join one month record

Question

I receive a request from my customer . He want generate a total sales record for a month and those data stored in daily sales table and customer table.
tblcustomer-20140101
tblcustomer-20140102
tblcustomer-20140103
tblcustomer-20141231
tblsales-20140101
tblsales-20140102
tblsales-20140103
tblsales-20141231
is there anyway when user select month name from application(ex: April), it will choose all april record and join it together?

Answer 1

Hi kjleong,
Generally to say, it is not a good practice to store the same entity data individually for each day, there are many shortages, such as the problem you posted in this thread. You can put all of them into one table and tag them with a DATE column. Anyway
in this case, to achieve your requirement, you may refer the below stored procedure(SP).
CREATE PROC ProcGetSales
@Year VARCHAR(20),
@Month VARCHAR(20)
AS
DECLARE @Date DATE;
DECLARE @Days INT;
DECLARE @SqlStr NVARCHAR(MAX);
SET @Date = @Year+'-'+@Month+'-01';
SET @Days = DATEDIFF(DAY,@Date,DATEADD(MM,1,@Date)); --get the days of the specific month
create a temp table
CREATE TABLE #Temp
col1 int --you should put the columns after join in your real envrioment here
table join statement, put the join result into a temp table
I dont know the columns so I use * here and the join condition is just based on assumption
you should modify the statement basing on your real environment
SET @SqlStr= 'INSERT INTO #Temp SELECT * FROM [tblcustomer-WhichDay] tc JOIN [tblsales-WhichDay] ts ON tc.customerID = ts.customerID';
DECLARE @Counter INT = 1;
WHILE @Counter <= @Days --loop the tables named after the specific month
BEGIN
DECLARE @Sql NVARCHAR(MAX) = REPLACE(@SqlStr,'WhichDay',CONVERT(VARCHAR(8),CAST(@Year+'-'+@Month+'-'+LTRIM(STR(@Counter)) AS DATE),112));
EXEC sp_executesql @Sql;
SET @Counter = @Counter+1;
END
SELECT * FROM #TEMP
The SP is not ready to use, you have to make some modification basing on your real environment before it works.
If you have any question, feel free to let me know.
Best regards,
Eric Zhang
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