CAST number as varchar, then update into another table as date - sql

Question

I'll as brief as possible, but start by saying I'm a network guy, not a DBA.
SQL Server Enterprise 11.0.5343
Scenario - Need to get three columns (each with a part of a date) together, and then update another table with the full date.
Source table: UT210AP
Columns:
UTONMM (Utility On Month - 2 digit)
UTONDD (Utility On Day - 2 digit)
UTONYY (Utility On Year - 2 digit)
UTONCV (Utility On Century - 0 = 19xx, 1 = 20xx)
I can select the data into a "date" with this code (the source data is on an IBM AS/400 linked server)
CAST(UTONMM as varchar) + '/' +
CAST(UTONDD as varchar) + '/' +
CASE WHEN UTONCV = '1'
THEN
RIGHT('20' + CONVERT(varchar(4), RIGHT('00' + CONVERT(varchar(4),UTONYY),2)),4)
ELSE
RIGHT('19' + CONVERT(varchar(4), UTONYY),4)
END AS UTON
And I get these results in the column I named "UTON":
4/6/1994
7/1/1988
11/14/1990
6/6/2014
QUESTION:
I have a nightly import job that runs, and I need to get the "date" (like 4/6/1994) into a field called TIME_CONNECT as part of this update statement from the job:
Update [responder].[Temp_RX_CUSTOMERS]
set CustomerID = lf.UTCSID
from [responder].[Temp_RX_CUSTOMERS] LEFT Outer Join
[HTEDTA].[THOR].[HTEDTA].UT210AP lf ON [responder].[Temp_RX_CUSTOMERS].LocationID = lf.UTLCID
where lf.UTOFMM = 0
The "UTOFMM" in the code above is "Utility Off Month", I don't even care about checking for it's value, I just want to get the "UTON" date from the top select statement into the "TIME_CONNECT" field in the "Temp_RX_CUSTOMERS" field.

Answer 1

Is this what you want? This copies the value into the field, assuming time_connect is a string.
Update [responder].[Temp_RX_CUSTOMERS]
set CustomerID = lf.UTCSID,
time_connect = (CAST(UTONMM as varchar) + '/' +
CAST(UTONDD as varchar) + '/' +
(CASE WHEN UTONCV = '1'
THEN RIGHT('20' + CONVERT(varchar(4), RIGHT('00' + CONVERT(varchar(4),UTONYY),2)),4)
ELSE RIGHT('19' + CONVERT(varchar(4), UTONYY),4)
END)
)
from [responder].[Temp_RX_CUSTOMERS] LEFT Outer Join
[HTEDTA].[THOR].[HTEDTA].UT210AP lf
ON [responder].[Temp_RX_CUSTOMERS].LocationID = lf.UTLCID
where lf.UTOFMM = 0;
If time_connect is a date/datetime data type, you can use datefromparts() (available in SQL Server 2012+):
Update [responder].[Temp_RX_CUSTOMERS]
set CustomerID = lf.UTCSID,
time_connect = DATEFROMPARTS(1800 + UTONCV * 100 + UNONYY,
UTONMM, UTONDD)
from [responder].[Temp_RX_CUSTOMERS] LEFT Outer Join
[HTEDTA].[THOR].[HTEDTA].UT210AP lf
ON [responder].[Temp_RX_CUSTOMERS].LocationID = lf.UTLCID
where lf.UTOFMM = 0;