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How to search a specific value in all tables (PostgreSQL)?
...e to search every column of every table for a particular value in PostgreSQL?
8 Answers
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SELECT DISTINCT on one column
Using SQL Server, I have...
7 Answers
7
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Replace Default Null Values Returned From Left Outer Join
I have a Microsoft SQL Server 2008 query that returns data from three tables using a left outer join. Many times, there is no data in the second and third tables and so I get a null which I think is the default for left outer join. Is there a way to replace the default values in the select stateme...
为什么你越努力，却越焦虑？ - 杂谈 - 清泛网 - 专注C/C++及内核技术
...自控能力的缘故，也可能和性格和其他因素有关。但无论如何，我深知，只要我给自己找了借口，我就会不遗余力地开始前功尽弃。对于经常把自我宽容混同为自我纵容的人来说，任何自我怜悯的借口实际上都只是自我欺骗。
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Should I use the datetime or timestamp data type in MySQL?
... you recommend using a datetime or a timestamp field, and why (using MySQL)?
39 Answers
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Left Join With Where Clause
...rry about JOIN/WHERE in the main query.
Sometimes, this works faster in MySQL, but compare it against the LEFT JOIN form to see what works best for you.
SELECT s.*, c.value
FROM settings s
LEFT JOIN character_settings c ON c.setting_id = s.id AND c.character_id = '1'
...
Force Java timezone as GMT/UTC
...se column does not keep timezone information.
The java.util.Date and java.sql.Date classes store the actual time (milliseconds) in UTC. To format these on output to another timezone, use SimpleDateFormat. You can also associate a timezone with the value using a Calendar object:
TimeZone tz = TimeZ...
计算统计特征（正态分布）函数及实例 - C/C++ - 清泛网 - 专注C/C++及内核技术
...count;
if (info._count > 1) {
/* NOTE: 删除时， 最大最小值无法还原 */
/*
if (v > info._max_v)
info._max_v = v;
if (v < info._min_v)
info._min_v = v;
*/
} else {
info._max_v = info._min_v = v;
}
if (info._count > 0)
info._ave = inf...
MySQL Query to select data from last week?
...
@Graph Yes, The SQL script above will be like that: SELECT id FROM tbl WHERE DATE > DATE_SUB(DATE(NOW()), INTERVAL DAYOFWEEK(NOW())+6 DAY) AND DATE <= DATE_SUB(DATE(NOW()), INTERVAL DAYOFWEEK(NOW())-1 DAY)
– Xman...
Is asynchronous jdbc call possible?
...usy/blocked per concurrent request.
If the underlying database drivers (MySql?) offers a means to intercept the socket creation (see SocketFactory) then I imagine it would be possible to build an async event driven database layer on top of the JDBC api but we'd have to encapsulate the whole JDBC be...