Open part of CSV with filter

[#1]

Hi,

What is the way to open a filtered part of CSV?

I have 300 Mb CSV but need only 10 Mb from it.

Please provide an example for Big Class.csv where height > 50 and Age = 15;

Thanks.

[#2]

I am not aware of any way to pass to the Excel Input Options a Where Clause.  Below is a script that effectively does that, but it first has to read in the entire data table

dt = Open(
	<"Path to your.csv">,
	columns(
		New Column( "name", Character, "Nominal" ),
		New Column( "age", Numeric, "Continuous", Format( "Best", 12 ) ),
		New Column( "sex", Character, "Nominal" ),
		New Column( "height", Numeric, "Continuous", Format( "Best", 12 ) ),
		New Column( "weight", Numeric, "Continuous", Format( "Best", 12 ) )
	),
	Import Settings(
		End Of Line( CRLF, CR, LF ),
		End Of Field( Comma, CSV( 1 ) ),
		Strip Quotes( 0 ),
		Use Apostrophe as Quotation Mark( 0 ),
		Use Regional Settings( 0 ),
		Scan Whole File( 1 ),
		Treat empty columns as numeric( 0 ),
		CompressNumericColumns( 0 ),
		CompressCharacterColumns( 0 ),
		CompressAllowListCheck( 0 ),
		Labels( 1 ),
		Column Names Start( 1 ),
		Data Starts( 2 ),
		Lines To Read( "All" ),
		Year Rule( "20xx" )),
	invisible
);
dt << select where(:height > 50 & :age == 15 );
dt2 = dt << subset( selected rows(1), selected columns(0) );
close(dt, nosave);

[#3 · Accepted solution]

You can do it with an ODBC driver. It is complicated, and I'm not sure what kind of performance you can expect. The JSL first, then the complicated setup steps. I made big class.csv in the samples\import directory; the bigclass.txt did not work on my first try, probably because of the extension or not having commas. There might be a way to fix that in the connection string.

New SQL Query(
	Connection(
		"ODBC:DSN=CSV;DBQ=C:\SPACE\SAS\JMP\15\SAMPLES\IMPORT DATA;DefaultDir=C:\SPACE\SAS\JMP\15\SAMPLES\IMPORT DATA;DriverId=27;FIL=text;MaxBufferSize=2048;PageTimeout=5;"
	),
	QueryName( "Big Class.csv" ),
	Select(
		Column( "name", "t1" ),
		Column( "age", "t1" ),
		Column( "sex", "t1" ),
		Column( "height", "t1" ),
		Column( "weight", "t1" )
	),
	From( Table( "Big Class.csv", Alias( "t1" ) ) ),
	Where(
		Custom( "t1.age=15 and t1.height>50", UI( Custom( Base( "Continuous" ) ) ) )
	)
) << Run

You'll have to set up a DSN on your computer. You probably don't have the driver. Download and install.

I found those by searching for the Microsoft Access ODBC CSV Driver

Install the 64 bit exe:

This took a minute

Set it up. Type ODBC in the windows start menu to find the 64 bit admin tool.

Use it in JMP. I stumbled about, some of the pictures may be less correct; the good stuff is at the end. File->Database is the starting point.

I think the file needs a CSV extension, but I didn't do enough experiments. With a CSV extension, and using commas, and NOT using quotation marks around numbers, it works. It looks like quotation marks will import strings, but there might be a way to fix that too.

[#4]

Thank you very much!!!!