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Insert, on duplicate update in PostgreSQL?
... the_table (id, column_1, column_2)
VALUES (1, 'A', 'X'), (2, 'B', 'Y'), (3, 'C', 'Z')
ON CONFLICT (id) DO UPDATE
SET column_1 = excluded.column_1,
column_2 = excluded.column_2;
Searching postgresql's email group archives for "upsert" leads to finding an example of doing what you poss...
Forward declaring an enum in C++
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edited Apr 9 '10 at 4:13
answered Sep 16 '08 at 14:02
KJ...
What are the differences between struct and class in C++?
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30 Answers
30
Active
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海量数据相似度计算之simhash短文本查找 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...imhash，计算量还是蛮大，普通PC 比较1000w次海明距离需要 300ms ，和5000w数据比较需要1.8 s。看起来相似度计算不是很慢，还在秒级别。给大家算一笔账就知道了：
随着业务增长需要一个小时处理100w次，一个小时为3600 *1000 = 360w毫...
Google Tag Manager 入门指南 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...
_gaq.push(
["_addOrganic", "baidu", "word"],
["_addOrganic", "so.360.cn", "q"],
["_addOrganic", "sogou", "query"],
["_addOrganic", "soso", "w"],
["_addOrganic", "gougou", "search"],
["_addOrganic", "youdao", "q"]
);
随着对业务分析的深入，我们会更频繁的修改这...
When should you use constexpr capability in C++11?
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303
Suppose it does something a little more complicated.
constexpr int MeaningOfLife ( int a, int ...
内存调试技巧：C 语言最大难点揭秘 - C/C++ - 清泛网 - 专注C/C++及内核技术
...分配的管理不是很困难。下面是一个示例（请参见清单 3）：
清单 3. 未初始化的指针
void f2(int datum)
{
int *p2;
/* Uh-oh! No one has initialized p2. */
*p2 = datum;
...
}
关于此类错误的好消...
How to do 3 table JOIN in UPDATE query?
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answered Mar 4 '13 at 19:28
echo_Meecho_Me
35.2k55 gold badges4848 silver badges7474 bronze badges
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Get environment variable value in Dockerfile
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edited Feb 15 '18 at 17:35
Yair Kukielka
8,86811 gold badge2929 silver badges3636 bronze badges
answer...
How to convert char to int?
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answered Sep 8 '10 at 9:03
Joel MuellerJoel Mueller
26.7k88 gold badges6161 silver badges8585 bronze badges
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