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[Solved] filtering last entry of each location

PostPosted: Wed Dec 12, 2018 4:13 am
by msahines
new here, did lots of searching and couldn't find the statement to find the answer my mind is looking for.

i have a database with fields as: StartDate, LocationID, EmployeeID, Equipment
all in a table named: Table1

i found the following code to filter the data, getting the max "StartDate" field and displaying the remainder fields. which works fine... as long as all the multiple location's latest start date is the same date, which it will not be.

Code: Select all   Expand viewCollapse view
SELECT * FROM "Table1" WHERE "StartDate" = ( SELECT MAX( "StartDate" ) FROM "Table1" )


can anyone point me to where to find something, or give me the code that will get me a query on getting the latest "StartDate" of each of the different "LocationID" 's please?

Re: filtering last entry of each location

PostPosted: Wed Dec 12, 2018 5:02 am
by FJCC
How about
Code: Select all   Expand viewCollapse view
SELECT * FROM "Table1"  INNER JOIN
( SELECT MAX( "StartDate" ) AS "MAXDATE", "LocationID" FROM "Table1" GROUP BY "LocationID" ) AS "MAXDATEQ"
ON "Table1"."StartDate" = "MAXDATEQ"."MAXDATE" AND "Table1"."LocationID" = "MAXDATEQ"."LocationID"

Re: filtering last entry of each location

PostPosted: Wed Dec 12, 2018 5:44 am
by msahines
exactly what i needed, all returning properly now. thank you very much!