added pandas apply, filter, transform and postgresql resources

Author: pybokeh

PyData/bookmarks.txt

@@ -2,6 +2,12 @@
 # NOTE: cmder mini requires 7-zip
 https://medium.com/talpor/windows-terminal-cmder-%EF%B8%8F-573e6890d143
 
+# pandas
+https://drawingfromdata.com/pandas/grouping/pandas-groupby-transform-aggregate-filter.html
+
+# PostgreSQL
+https://hakibenita.com/postgresql-unknown-features
+
 # PySpark
 https://jacobcelestine.com/knowledge_repo/colab_and_pyspark/
 https://sparkbyexamples.com/