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How can I alter a primary key constraint using SQL syntax?
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ALTER TABLE db.table DROP PRIMARY KEY is for MySQL. (Not MSSQL.)
– Roy Latham
Sep 25 at 16:43
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How can I edit a view using phpMyAdmin 3.2.4?
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Why are Oracle table/column/index names limited to 30 characters?
... can be extremely painful when doing migration projects from SQL Server or MySQL to Oracle. In Oracle Database 12cR2, the maximum length of most identifiers is now 128 characters.
This is a new feature in 12.2, according to (http://blog.dbi-services.com/oracle-12cr2-long-identifiers/). According t...
git - Find commit where file was added
...ly, but i have similar use case, where i generally stay within the project root of a git directory and issue commands from there, and using the supplied one liner git log --diff-filter=A -- foo.js did not print the commit ID / hash to STDOUT in my terminal rather i had to provide the relative path t...
How to print the ld(linker) search path
...e prints out
/usr/lib64/atlas:
/usr/lib/llvm:
/usr/lib64/llvm:
/usr/lib64/mysql:
/usr/lib64/nvidia:
/usr/lib64/tracker-0.12:
/usr/lib/wine:
/usr/lib64/wine:
/usr/lib64/xulrunner-2:
/lib:
/lib64:
/usr/lib:
/usr/lib64:
/usr/lib64/nvidia/tls: (hwcap: 0x8000000000000000)
/lib/i686: (hwcap: 0x0008000000...
从源代码剖析Mahout推荐引擎 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...。
通过“策略模式”匹配不同的数据源，支持File, JDBC(MySQL, PostgreSQL), NoSQL(Cassandra, HBase, MongoDB)。
注：NoSQL的实现在mahout-integration-0.8.jar中。
数据格式支持2种：
GenericDataModel: 用户ID，物品ID，用户对物品的打分(UserID,ItemID,Pre...
Why doesn't C have unsigned floats?
... log of values < 1, you couldn't solve quadratic equations: x = (-b +/- root (b.b - 4.a.c)) / 2.a, and so on. In fact, it probably wouldn't work for any complex function as these tend to be implemented as polynomial approximations which would use negative values somewhere.
So, unsigned floats ar...
How safe is it to store sessions with Redis?
I'm currently using MySql to store my sessions. It works great, but it is a bit slow.
3 Answers
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What is the “realm” in basic authentication
...nge. The realm value
(case-sensitive), in combination with the canonical root URL of the
server being accessed, defines the protection space. These realms
allow the protected resources on a server to be partitioned into a set
of protection spaces, each with its own authentication scheme and/...
What is JavaScript garbage collection?
...o reference point to it
Mark-and-sweep algorithm: connect each objects to root source. any object doesn't connect to root or other object. this object will be removed.
currently most modern browsers using the second algorithm.
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