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4. Pivot, Unpivot (参考源) Pivot SELECT * FROM [StudentScores] /*数据源*/ AS P PIVOT ( SUM(Score/*行转列后 列的值*/) FOR p.Subject/*需要行转列的列*/ IN ([语文],[数学],[英语],[生 阅读全文
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1. PL/SQL 转义 select order#, ……… from **** select col1 from A where col2 like '%\_keywors%' escape '\'; update A set url = 'homepage.aspx?code=32' || ' 阅读全文
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excel address ( var cr = new CellReference("D5");) 1 var workbook = new XSSFWorkbook(stream); 2 var sheet = workbook.GetSheetAt(0); 3 4 var cr = new C 阅读全文
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原文链接:https://www.vultr.com/docs/install-apache-activemq-on-ubuntu-20-04/ Introduction A message broker enables applications to communicate with each o 阅读全文
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1. log config if ($time_iso8601 ~ "^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2})") { set $year $1; set $month $2; set $day $3; set $hour $4; set $m 阅读全文
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C# Object Clone Wars Cloning C# objects is one of those things that appears easy but is actually quite complicated with many "gotchas." This article d 阅读全文