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Difference between CLOB and BLOB from DB2 and Oracle Perspective?
...es, documents, other)
CLOB is for large text data (text)
Maximum size on MySQL 2GB
Maximum size on Oracle 128TB
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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...
HTTP authentication logout via PHP
...cookie, with the persistence of state stored on the server in some manner (mysql, sqlite, flatfile, etc). This will require all requests to be evaluated, for instance, with PHP.
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What is the Oracle equivalent of SQL Server's IsNull() function?
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+1: COALESCE is ANSI, supported by Postgres, MySQL... The only caveat is that it doesn't necessarily perform as fast as native syntax.
– OMG Ponies
Aug 19 '10 at 17:33
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getting date format m-d-Y H:i:s.u from milliseconds
....433818
10-29-2015 11:40:09.433818
Note that if you want to input into mysql, the time format needs to be:
format("Y-m-d H:i:s.u")
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mysqli or PDO - what are the pros and cons? [closed]
In our place we're split between using mysqli and PDO for stuff like prepared statements and transaction support. Some projects use one, some the other. There is little realistic likelihood of us ever moving to another RDBMS.
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Set a DateTime database field to “Now”
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Oops yes NOW() is Mysql, sorry. But the questions remains.
– Thibault Witzig
Dec 20 '10 at 9:38
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How do I get the current date in JavaScript?
... == 'Y-\\WW'
'isoYearWeekDay' == 'Y\\WWj'
'isoYearWeekDay2' == 'Y-\\WW-j'
'mySQL' == 'Y-m-d h:i:s'
'postgreSQL' == 'Y.z'
'postgreSQL2' == 'Yz'
'soap' == 'Y-m-d\\TH:i:s.u'
'soap2' == 'Y-m-d\\TH:i:s.uP'
'unixTimestamp' == '@U'
'xmlrpc' == 'Ymd\\TG:i:s'
'xmlrpcCompact' == 'Ymd\\tGis'
'wddx' == 'Y-n-j\\...
Java - escape string to prevent SQL injection
... ' to \' , and any \n to \\n so that when the string is evaluated by MySQL SQL injections will be blocked.
12 Answer...
PostgreSQL delete with inner join
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@0mesh its for mysql .. my doubt is for sql and postgre sql
– dude
Aug 1 '12 at 6:51
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