count_nulls =========== Provides a function that counts the number of (not) null arguments passed to it. Also provides a version for counting nulls in a JSON document, which makes it easy to count the number of nulls in a record. # Installation # To build it, just do this: make install If you encounter an error such as: "Makefile", line 8: Need an operator You need to use GNU make, which may well be installed on your system as `gmake`: gmake install If you encounter an error such as: make: pg_config: Command not found Be sure that you have `pg_config` installed and in your path. If you used a package management system such as RPM to install PostgreSQL, be sure that the `-devel` package is also installed. If necessary tell the build process where to find it: env PG_CONFIG=/path/to/pg_config make && make installcheck && make install And finally, if all that fails (and if you're on PostgreSQL 8.1 or lower, it likely will), copy the entire distribution directory to the `contrib/` subdirectory of the PostgreSQL source tree and try it there without `pg_config`: env NO_PGXS=1 make && make installcheck && make install If you encounter an error such as: ERROR: must be owner of database regression You need to run the test suite using a super user, such as the default "postgres" super user: make test PGUSER=postgres Once count_nulls is installed, you can add it to a database. If you're running PostgreSQL 9.1.0 or greater, it's a simple as connecting to a database as a super user and running: CREATE EXTENSION count_nulls; If you've upgraded your cluster to PostgreSQL 9.1 and already had count_nulls installed, you can upgrade it to a properly packaged extension with: CREATE EXTENSION count_nulls FROM unpackaged; For versions of PostgreSQL less than 9.1.0, you'll need to run the installation script: psql -d mydb -f /path/to/pgsql/share/contrib/count_nulls.sql If you want to install count_nulls and all of its supporting objects into a specific schema, use the `PGOPTIONS` environment variable to specify the schema, like so: PGOPTIONS=--search_path=extensions psql -d mydb -f count_nulls.sql Dependencies ------------ The `count_nulls` data type has no dependencies other than PostgreSQL. Copyright and License --------------------- Copyright (c) 2015 Jim Nasby, Blue Treble Consulting http://BlueTreble.com