How can i handle Insert from select statement using trigger in sqlserver - sql-server

Question

I have the following TSQL statements to insert data from one database Table to another database tables, how can i mange this using Trigger?
the Source table is [DISCS] and the destination tables are,
[WIBOMH] is a Master table, [WIBOMH] is a header table, [WIBOMD] is detail table so
the orders have to be first insert into [WIITEM] then create a header [WIBOMH]
I want to fire this AFTER INSERT. when i added a new DISC into DISC Table i would like to fire the following insert statement
-- Insert into [WIITEM] Table---
INSERT INTO [WIITEM]
([itemId], [descr],[xdesc],[sales] ,[uOfM] ,[poUOfM] ,[uConvFact],[ref],[type],[status],[unitWgt] )
SELECT [itemId], [PURCHASE_DESCRIPTION], [SALES_DESCRIPTION], [sales] ,[uOfM] ,[poUOfM] ,[uConvFact],'TESTING', '2','0',[unitWgt]
FROM [DISCS]
WHERE [itemId] NOT IN (SELECT [itemId] FROM [WIITEM])
AND [makebuy]='Make';
-- Insert into [WIBOMH] Table---
DECLARE #d DATETIME = GETDATE();
INSERT INTO [WIBOMH]
([bomItem], [bomRev], [rollup], [mult], [autoBuild], [assyLead],[revCmnt],[author],[descr],[qPerLead],[lstMainDt],[revDate],[effStartDate],[ovride] )
SELECT DISTINCT [bomitem], 'B', '1', '1', '1', '3','TESTING','USER NAME','TESTING','0', FORMAT(#d, 'yyyy-MM-dd HH\:mm\:ss\.fff', 'en-US') AS 'Format#1',FORMAT(#d, 'yyyyMMdd' , 'en-US') AS 'Format#2',FORMAT(#d, 'yyyyMMdd' , 'en-US') AS 'Format#2','0'
FROM [DISCS]
WHERE [bomitem] IN (SELECT [ItemId] FROM [WIITEM] where type='2')
AND [bomitem] NOT IN (SELECT [bomItem] FROM [WIBOMH]);
-- Insert into [WIBOMD] Table---
INSERT INTO [WIBOMD]
([bomItem], [bomRev], [bomEntry], [partId], [qty],[cmnt],[srcLoc],[dType],[lead],[lineNbr])
SELECT [ItemID], 'B', [bomEntry], [partid], [qty],'TESTING','WSD-DS','0','0', [lineNbr]
FROM [DISCS]
WHERE [ItemID] IN (SELECT [ItemId] FROM [WIITEM] where type='2')
AND [ItemID] NOT IN (SELECT [bomItem] FROM [WIBOMD]);
i tried
INSERT INTO [MITESTCO].[WIITEM]
([itemId], [descr],[xdesc],[sales] ,[uOfM] ,[poUOfM] ,[uConvFact],[ref],[type],[status])
SELECT
[CALC STOCK PN], [PURCHASE DESCRIPTION], [SALES DESCRIPTION], [CALC STOCK PN] ,'EA' ,'EA' ,'1','SYNC FROM PDM', '2','0'--,[APPROX. WGT.]
FROM inserted
WHERE [MAKE / BUY]='Make' [CALC STOCK PN] NOT IN (SELECT [itemId] FROM [MIITEM] WHERE itemId NOT LIKE '*-CI');
but i get
invalid object [MITESTCO].[WIITEM]
here i got the first trigger working
create TRIGGER [dbo].[PNSETUP]
ON [dbo].[DISCS]
AFTER insert,UPDATE
AS
BEGIN
IF TRIGGER_NESTLEVEL() > 1
RETURN
SET ANSI_WARNINGS OFF;
INSERT INTO MITESTCO.dbo.WIITEM
([itemId], [descr],[xdesc],[sales] ,[uOfM] ,[poUOfM] ,[uConvFact],[ref],[type],[status])--,[unitWgt]
SELECT [CALC STOCK PN], [PURCHASE DESCRIPTION], [SALES DESCRIPTION], [CALC STOCK PN] ,'EA' ,'EA' ,'1','SYNC FROM PDM', '2','0'--,[APPROX. WGT.]
FROM [DISCS]
WHERE [CALC STOCK PN] NOT IN (SELECT [itemId] FROM MITESTCO.dbo.[WIITEM] WHERE itemId NOT LIKE '*-CI')
AND [MAKE / BUY]='Make';
SET ANSI_WARNINGS ON;
how can i add the next two insert select statement to same trigger

Answer 1

You can use after insert trigger to update the count after each insertion.

Answer 2

Do you need a trigger ? Do you need to copy the new rows from the table in real time ?
Triggers will KILL the insert performance of your table.
Consider adding a column DateLastCopied to the source table, and then once a minute
declare #now as datetime= getdate()
update sourcetable set DateLastCopied=#now where DateLastCopied is null
insert into targetTable(..)
select ...
FROM sourcetable where DateLastCopied=#now