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拉里佩奇23条箴言帮你度过创业低谷 - 资讯 - 清泛网 - 专注C/C++及内核技术

...VCR也没能让电影院关门。 13。“如果让我用一句话总结如何改变世界,我会说,努力工作,为那些真正激动人心的事物。” 不是所有人都想要创造一辆无人驾驶车,或者清洁能源,或者解决十亿人的痛点。但在我内心,有一份...
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SQL/mysql - Select distinct/UNIQUE but return all columns?

...ause the behavior on the other columns is unspecified. (The first works in MySQL, if that's what you're using.) You could fetch the distinct fields and stick to picking a single arbitrary row each time. On some platforms (e.g. PostgreSQL, Oracle, T-SQL) this can be done directly using window funct...
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MySQL WHERE: how to write “!=” or “not equals”?

...ered Jul 10 '12 at 20:53 RolandoMySQLDBARolandoMySQLDBA 40.6k1515 gold badges8181 silver badges124124 bronze badges ...
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MySQL - why not index every field?

... The link is for MS SQL Server; this question is for MySQL – OMG Ponies Mar 26 '11 at 23:38 6 ...
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MySQL: Order by field size/length

... @mastazi according to MySQL documentation: OCTET_LENGTH() is a synonym for LENGTH(). – Heitor Oct 1 '17 at 5:35 ...
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Is there a MySQL option/feature to track history of changes to records?

I've been asked if I can keep track of the changes to the records in a MySQL database. So when a field has been changed, the old vs new is available and the date this took place. Is there a feature or common technique to do this? ...
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Multiple queries executed in java in single statement

...BC as it currently provides an exception even though it is possible in the MySQL query browser. 6 Answers ...
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How do I rename a column in a database table using SQL?

... This is not supported in MySQL, is it? – ustun Oct 21 '11 at 11:41 5 ...
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MySQL - ORDER BY values within IN()

... @Vladimir - yes, it is MySQL-specific. The question has the mysql tag. – Ayman Hourieh Jun 6 '09 at 1:10 ...
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How do I find which transaction is causing a “Waiting for table metadata lock” state?

...ransactions waiting for locks: SELECT TRX_ID, TRX_REQUESTED_LOCK_ID, TRX_MYSQL_THREAD_ID, TRX_QUERY FROM INNODB_TRX WHERE TRX_STATE = 'LOCK WAIT'; Reference - MySQL Troubleshooting: What To Do When Queries Don't Work, Chapter 6 - Page 96. ...