## mark a section (Learn more)

// selecting a block id and data by row example in PostgreSQL: postgres=> select ctid, * from baz; ctid | id | name -------+----+------- (0,1) | 1 | kenny // nice to have for mongodb: > db.kg.find() { "_block":0001,"_id" : ObjectId("4bd6027e7d4426ce1a436e01"), "0" : { "name" : "kenny" } }

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