Question

I have two tables;

Technology Look Up table

OSID  OSValue  

1     UNIX             
2     ORACLE            
3     .NET 
4     SQL    
5     SAP  

------------------

Employee technology

empID   OSID

34      1
37      2
45      2
34      4
45      6

Employee ID NO 37 is no more using ORACLE . He shifted to SAP . That is OSID should b updated from 2 to 5 in the second table .

I have a temp table that has vales for technology and employee id

Please help me with
– writing a query that joins both above tables
– Look up the ID of the SAP technology , and update the second table with that ID .

Update emp
Set emp.OSID = (Select OSID from technologylookup where OSValue = tmptbl.technologyname)
FROM employee_tech emp INNER JOIN #Temptbl tmptbl ON emp.emp_id = tmptbl.emp_id

Answer 1

Join your lookup table to the temp table, and then update the employee_tech table with the ID from that table

Update emp
   Set emp.OSID = tl.OSID
FROM employee_tech emp 
INNER JOIN #Temptbl tmptbl 
   ON emp.emp_id = tmptbl.emp_id
INNER JOIN technologylookup tl
   ON tl.OSValue COLLATE DATABASE_DEFAULT = tmptbl.technologyname