PostgreSQL
Creating Your First Database User and Schema in PostgreSQL
Create your first PostgreSQL role, database and schema: CREATE ROLE with LOGIN, a database with an owner, search_path, and the public schema change.
7 min read
Library
Everything you need to level up your coding skills.
PostgreSQL
Running PostgreSQL in Docker With a Persistent Volume
Run PostgreSQL in Docker with a named volume so data survives restarts, set the password and database on first start, publish the port safely and use Compose.
7 min read
PostgreSQL
Installing PostgreSQL on macOS Linux and Windows Today
Install PostgreSQL on macOS with Homebrew, on Linux with packages and on Windows with the installer, then check that the service runs.
7 min read
PostgreSQL
Storing Uploaded Excel Files and Their Parsed Rows
Store uploaded Excel files and their parsed rows in PostgreSQL: keep the original, stage, track errors, dedupe by hash and link rows to uploads.
7 min read
PostgreSQL
Reading XML With xmltable in a Real Import in PostgreSQL
Import XML into PostgreSQL with xmltable: XPath row and column paths, namespaces, attributes, nested elements, large files and validation of a feed.
6 min read
PostgreSQL
Exporting JSON Lines From a Query in PostgreSQL Safely
Export JSON Lines from a PostgreSQL query with row_to_json or to_jsonb and COPY TO STDOUT, handle quoting, types, nulls, large results and compression.
6 min read
CSV
PostgreSQL CSV Versus Text Format in COPY and Which to Use
PostgreSQL COPY has a CSV format and a text format that differ in delimiter, NULL marker and escaping. See the same rows in both and what a mismatch loads.
6 min read
PostgreSQL
SQL JSON Support Added in Recent Versions of PostgreSQL
SQL/JSON in PostgreSQL 16 to 18: constructors, IS JSON, JSON_EXISTS, JSON_QUERY, JSON_VALUE and JSON_TABLE, with examples.
6 min read
PostgreSQL
Partitioning Mistakes That Make PostgreSQL Queries Slower
Partitioning mistakes that make PostgreSQL queries slower: wrong key, too many partitions, id lookups, missing pruning, tiny partitions and fixes for each.
7 min read
CSV
A Python Script That Loads a Daily CSV Into PostgreSQL
A complete psycopg 3 script that stages a daily CSV with COPY, merges it with an upsert, records a content hash, and is safe to run again after a failure.
8 min read
PostgreSQL
Partition Pruning in PostgreSQL and Checking It Works
Partition pruning in PostgreSQL explained: plan time and run time pruning, what defeats it, how to read EXPLAIN output and a checklist for fixing queries.
7 min read
JSON
Normalizing a JSON Export Into Relational Tables Safely
Turn a blog export with authors, tags and comments into five PostgreSQL tables, with a tag junction table, merged author copies and checks against the source.
8 min read
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