大约有 7,000 项符合查询结果(耗时:0.0183秒) [XML]

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How do I calculate square root in Python?

...valuate to 0. And for the record, the preferred way to calculate a square root is this: import math math.sqrt(x) share | improve this answer | follow | ...
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How to choose the id generation strategy when using JPA and Hibernate

...table. Do not use in a cluster. identity supports identity columns in DB2, MySQL, MS SQL Server, Sybase and HypersonicSQL. The returned identifier is of type long, short or int. sequence uses a sequence in DB2, PostgreSQL, Oracle, SAP DB, McKoi or a generator in Interbase. The returned identifier is...
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In the shell, what does “ 2>&1 ” mean?

.../tmp /tnt ls: cannot access /tnt: No such file or directory drwxrwxrwt 118 root root 196608 Jan 7 11:49 /tmp $ ls -ld /tmp /tnt >/dev/null ls: cannot access /tnt: No such file or directory $ ls -ld /tmp /tnt 2>/dev/null drwxrwxrwt 118 root root 196608 Jan 7 11:49 /tmp (Expecting you don't...
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COUNT(*) vs. COUNT(1) vs. COUNT(pk): which is better? [duplicate]

... are using as well as the type of table in some cases. For example, using MySQL, count(*) will be fast under a MyISAM table but slow under an InnoDB. Under InnoDB you should use count(1) or count(pk). share | ...
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How can I query a value in SQL Server XML column

... select Roles from MyTable where Roles.value('(/root/role)[1]', 'varchar(max)') like 'StringToSearchFor' These pages will show you more about how to query XML in T-SQL: Querying XML fields using t-sql Flattening XML Data in SQL Server EDIT After playing with it a little b...
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How to set the context path of a web application in Tomcat 7.0

I know that I can rename my webapp (or it's WAR file) to ROOT but this is a terrible way to do it, IMHO. Now I checked out the tomcat doc & it says ...
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ActiveRecord: List columns in table from console

...console. It will enter the shell of your database, whether it is sqlite or mysql. Then, you can query the table columns using sql command like: pragma table_info(your_table); share | improve thi...
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Pseudo-terminal will not be allocated because stdin is not a terminal

...ee: check if file exists on remote host with ssh). # version 1 unset DEP_ROOT REL_DIR DEP_ROOT='/tmp' datestamp=$(date +%Y%m%d%H%M%S) REL_DIR="${DEP_ROOT}/${datestamp}" ssh localhost /bin/bash <<EOF if [ ! -d "$DEP_ROOT" ] && [ ! -e "$DEP_ROOT" ]; then echo "creating the root dir...
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Querying data by joining two tables in two database on different servers

... is it possible with php-mysql ..if yes then can you please suggest me a way how can i grow with that option? – Jhanvi Sep 26 '12 at 8:47 ...
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How to change current working directory using a batch file

...need some help in writing a batch file. I have a path stored in a variable root as follows: 4 Answers ...