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In Java, what is the best way to determine the size of an object?
... Pattern.normalizedPattern (object)
44 4 Node Pattern.root (object)
48 4 Node Pattern.matchRoot (object)
52 4 int[] Pattern.buffer null
56 4 Map Pattern.namedGroups null
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Querying data by joining two tables in two database on different servers
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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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领域驱动设计系列（五）:事件驱动之异步事件 - 更多技术 - 清泛网 - 专注C/...
...以。
另外，异步要处理的东西很多，比如处理完毕后，如何通知用户，还是让用户刷新？ 我个人建议，一般情况下都不要用异步，只有在真的需要的时候再用。
作者: 王德水
出处：http://deshui.wang
领域驱动设计 DDD 事件驱...
How to add a primary key to a MySQL table?
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mysql doesn't recognize MODIFY as proper statement(at least in XAMPP, InnoDB)
– LMD
Jul 13 '18 at 18:25
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What can you use Python generator functions for?
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Real World Example
Let's say you have 100 million domains in your MySQL table, and you would like to update Alexa rank for each domain.
First thing you need is to select your domain names from the database.
Let's say your table name is domains and column name is domain.
If you use SELECT...
Limit results in jQuery UI Autocomplete
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If the results come from a mysql query, it is more efficient to limit directly the mysql result:
select [...] from [...] order by [...] limit 0,10
where 10 is the max numbers of rows you want
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Difference between Key, Primary Key, Unique Key and Index in MySQL
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KEY and INDEX are synonyms in MySQL. They mean the same thing. In databases you would use indexes to improve the speed of data retrieval. An index is typically created on columns used in JOIN, WHERE, and ORDER BY clauses.
Imagine you have a table called...
How do I convert from BLOB to TEXT in MySQL?
I have a whole lot of records where text has been stored in a blob in MySQL. For ease of handling I'd like to change the format in the database to TEXT... Any ideas how easily to make the change so as not to interrupt the data - I guess it will need to be encoded properly?
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Select all columns except one in MySQL?
... trying to use a select statement to get all of the columns from a certain MySQL table except one. Is there a simple way to do this?
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How to add not null constraint to existing column in MySQL
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Oddly I was getting an error (MySQL 5.6, Workbench 6.3) changing/modifying a column I'd named null_heart_rate_count, error was #1138, Invalid use of NULL value. I had to drop and add the column instead.
– William T. Mallard
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