[Solved] filtering last entry of each location

Creating tables and queries
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msahines
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[Solved] filtering last entry of each location

Post 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

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?
Last edited by robleyd on Wed Dec 12, 2018 5:55 am, edited 2 times in total.
Reason: Tagged [Solved] [robleyd, Moderator]
openoffice 4.1.5 on windows
FJCC
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Re: filtering last entry of each location

Post by FJCC »

How about

Code: Select all

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" 
OpenOffice 4.1 on Windows 10 and Linux Mint
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msahines
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Re: filtering last entry of each location

Post by msahines »

exactly what i needed, all returning properly now. thank you very much!
openoffice 4.1.5 on windows
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