firebase - FireStore Swift 4 : How to get total count of all the documents inside a collection, and get details of each document? - Stack Overflow
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GRDB.swift on iOS Dev Tools
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ios-fmdb-dtg/FMDatabase.h at master · kaltura/ios-fmdb-dtg · GitHub
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移动端数据库新王者：realm - 李洪强- 博客园
FMDB 使用方法- 简书
FM Athlete Blog — CoffeehouseFM - Football Manager Blogs
Calculate the count is very slow · Issue #3881 · realm/realm-swift · GitHub
GitHub - ccgus/fmdb: A Cocoa / Objective-C wrapper around SQLite
