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COUNT(*) vs. COUNT(1) vs. COUNT(pk): which is better? [duplicate]
...T(tableHere) or COUNT(tableHere.*), use that.
In short, don't use COUNT(1) for anything. It's a one-trick pony, which rarely does what you want, and in those rare cases is equivalent to count(*)
Use count(*) for counting
Use * for all your queries that need to count everything, even for joins, ...
Why Maven uses JDK 1.6 but my java -version is 1.7
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edited May 28 '15 at 13:50
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Rename Pandas DataFrame Index
...ut with df.rename() only the column name is renamed. Bug? I'm on version 0.12.0
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ERROR ITMS-9000: “Redundant Binary Upload. There already exists a binary upload with build version '
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What is /dev/null 2>&1?
... the same net effect. I usually just use > for that reason.)
2>&1 redirects standard error (2) to standard output (1), which then discards it as well since standard output has already been redirected.
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Is there a difference between x++ and ++x in java?
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VM 磁盘空间扩容引起的一些问题 - 更多技术 - 清泛网 - 专注C/C++及内核技术
VM 磁盘空间扩容引起的一些问题TOP如下存储分区如下ESX1下挂载情况如下图ESX2下挂载情况如下图现在有个需求，lun60的空间偏大，缩小为1T，LUN80的空间偏小，扩大为1.5T先...TOP 如下
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