Tomas Greif

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Tomas Greif has asked 69 questions and find answers to 35 problems.

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Tomas Greif questions

PostgreSQL - use date constant in c function
Stretch time series efficiently in SQL
Return name of data frame from function
Identify Inf in sqldf
Pass arguments to function using ellipsis and set default for some if not existing
Access PostGIS from R on Windows XP
PostgreSQL CAST(x AS typename) or x::typename
Improve performance of custom aggregate function in PostgreSQL
Convert escaped Unicode character back to actual character in PostgreSQL
Filter data frame based on multiple conditions in another data frame

Tomas Greif answers

PostgreSQL - use date constant in c function
How to distinguish photo from picture?
Dynamic SQL Query in R (WHERE)
Group by floating date range
Select data for 15 minute windows - PostgreSQL
Postgresql k-nearest neighbor (KNN) on multidimensional cube
Calculating the Weighted Average Cost of products stock
postgres random using setseed
Typo in `dplyr::percent_rank`?
How to create a database that shows a calendar of availability for a set of apartments?