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Cannot add or update a child row: a foreign key constraint fails
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24 Answers
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Break promise chain and call a function based on the step in the chain where it is broken (rejected)
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The reason your code doesn't work as expected is that it's actually doing something different ...
What's quicker and better to determine if an array key exists in PHP?
Consider these 2 examples...
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ZMQ: 基本原理 - 开源 & Github - 清泛网 - 专注C++内核技术
... ZMQ: 基本原理 来源：开源中国 2016-01-18 16:10:01 人气： 我有话说( 0 人参与) 介绍与其他的基于常规理论基础的（集中）通信系统不同，几乎没有分布式通信系统的什么资料，ØMQ(ZeroM...
Print array elements on separate lines in Bash?
...te argument, while "$*"
expands to the args merged into one argument: "$1c$2c..." (where c is
the first char of IFS).
You almost always want "$@". Same goes for "${arr[@]}".
Always quote them!
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Extract date (yyyy/mm/dd) from a timestamp in PostgreSQL
...te by suffixing it with ::date. Here, in psql, is a timestamp:
# select '2010-01-01 12:00:00'::timestamp;
timestamp
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2010-01-01 12:00:00
Now we'll cast it to a date:
wconrad=# select '2010-01-01 12:00:00'::timestamp::date;
date
------------
2010-01-01
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facebook: permanent Page Access Token?
...hat appears in the "Access Token" field is your short-lived access token.
2. Generate Long-Lived Access Token
Following these instructions from the Facebook docs, make a GET request to
https://graph.facebook.com/v2.10/oauth/access_token?grant_type=fb_exchange_token&client_id={app_id}&c...
No == operator found while comparing structs in C++
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In C++, structs do not have a comparison operator generated by default. You need to write your ...
Reference — What does this symbol mean in PHP?
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Force line-buffering of stdout when piping to tee
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edited Oct 9 '18 at 18:21
Greg Dubicki
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