|Subject:||Re: Getting PSPP compiled version with PostgreSQL support|
|Date:||Sat, 19 Mar 2016 13:48:13 -0500|
|User-agent:||Mozilla/5.0 (Windows NT 6.1; WOW64; rv:38.0) Gecko/20100101 Thunderbird/38.6.0|
My replies are inline below.
On 3/19/2016 9:38 AM, Harry Thijssen wrote:
It sounds like Philip will use the Linux version, but if we wanted to test this, I'm happy to help using either 32- or 64-bits. It would be more convenient to me to test the Windows version by reading data from PostgreSQL running on a Linux host.
I'd be curious to hear how Philip is using this feature because if you can get data from a database using a single select statement, then you can also redirect those data into a TAB delimited file. So, this just saves you a step and I guess it would be mostly useful when you have to do it frequently. But most of the databases I work with cannot (that I know of) generate the kind of data I want using a single select. The typical database I use stores respondent meta data in a table like "respondents" and item meta data in a table like "items" and responses in a table like "responses". (Without any promise that all respondents have answered the same items.) So, I have to write a small script in some higher-level language to marshal these data and output the rectangular (rows and columns) data that PSPP expects as a TAB-delimited file. The other common use I make of databases is simply to store YAML strings of serialized data structures that internally contain the state of a survey, including responses, etc. Directly SELECT'ing this state column is even less helpful.
Also, of course, SQL engines typically have in-built functions to compute simple descriptive statistics on SELECT'ed data (e.g., SELECT AVG(elapsed_time) FROM data WHERE grade = "pass"; SELECT AVG(elapsed_time) FROM data GROUP BY grade;)
So, in short, although I'm sure that some people find it useful, I personally have never been tempted in SPSS or PSPP by the ability to sample data directly from an SQL table. I suspect that it's an infrequent case where it's useful; but maybe it's sufficiently critical in that edge case to warrant better support. When Philip raised this, I searched the web for "pspp postrgsql" and PostgreSQL support is an advertised feature of PSPP that appears in many places on the web.
I ran the syntax snippet in the manual:
and PSPP output was:
error: Support for reading postgres databases was not compiled into this installation of PSPP
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