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2. 自己紹介 SELECT '{ "名前":"ぬこ@横浜", "Twitter":"@nuko_yokohama", "所属":{"会社":"某通信系ソフトウェア会社", "部署":"クラウドな感じ", "勤務地":"ミナトミライ・スゴイトオイビル"}, "仕事":"PostgreSQLあれこれ", "趣味":["猫","ラーメン","スパ","バイク旅","PostgreSQL"], "メモ":["PostgreSQLは7.4の頃からの腐れ縁", "ときどきPostgreSQLイベントで喋ってます","ただのユーザ"], "作ったもの":["漢数字型(ksj)","類似文字型(ntext)", "new4j_fdw", "hit_and_blow BGW", "pg_heartman"]}'::jsonb;
PostgreSQL 9.3 has a new join type! Lateral joins arrived without a lot of fanfare, but they enable some powerful new queries that were previously only tractable with procedural code. In this post, I’ll walk through a conversion funnel analysis that wouldn’t be possible in PostgreSQL 9.2. Interested in learning more about Heap Engineering? Meet our team to get a feel for what it’s like to work at
Postgres has a rich set of features, even when working everyday with it you may not discover all it has to offer. In hopes of learning some new features that I didn’t know about myself as well as seeing what small gems people found joy in I tweeted out to see what people came back from. The response was impressive, and rather than have it lost into ether of twitter I’m capturing some of the respon
This weekend Dr Nic shared with us a well written article discussing the shortcomings of auto-incrementing (serial) keys and an alternative approach. While discussing the article the question came up about how to go about using UUID keys in our applications and what we have to do within PostgreSQL in order to use them. PostgreSQL out of the box defines a UUID Data Type which is a great start. We t
INSERT INTO products (name, attributes) VALUES ( 'Geek Love: A Novel', 'author => "Katherine Dunn", pages => 368, category => fiction' ); SELECT name, attributes->'author' as author FROM products WHERE attributes->'category' = 'fiction' Copy The obvious benefit here is flexibility, but where it really shines is being able to leverage various index types. In particular, a GIN or GiST index will ind
Customizing My Postgres Shell Written by Craig Kerstiens July 16, 2017 As a developer your CLI is your home. You spend a lifetime of person-years in your shell and even small optimizations can pay major dividends to your efficiency. For anyone that works with Postgres and likely the psql editor, you should consider investing some love and care into psql. A little known fact is that psql has a numb
PostgreSQL 9.3 introduced new kind of SQL join type that can be useful for solving problems that needed some more advanced techniques (like builtin procedural language PL/pgSQL) in prior versions. According to the official documentation: The LATERAL key word can precede a sub-SELECT FROM item. This allows the sub-SELECT to refer to columns of FROM items that appear before it in the FROM list. (Wit
PostgreSQL 9.5 introduces support for TABLESAMPLE, an SQL SELECT clause that returns a random sample from a table. SQL:2003 defines two sampling methods: SYSTEM and BERNOULLI. The SYSTEM method uses random IO whereas BERNOULLI uses sequential IO. SYSTEM is faster, but BERNOULLI gives us a much better random distribution because each tuple (row) has the same probability on being selected. The SYSTE
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