大约有 3,620 项符合查询结果（耗时：0.0176秒） [XML]
Why is Magento so slow? [closed]
...slow
Parts of Magento use an EAV database system implemented on top of MySQL. This means querying for a single "thing" often means querying multiple rows
There's a lot of things behind the scenes (application configuration, system config, layout config, etc.) that involve building up giant XML tr...
Java: Why is the Date constructor deprecated, and what do I use instead?
...er compliant with JDBC 4.2 or later. No need for strings, no need for java.sql.* classes.
Where to obtain the java.time classes?
Java SE 8, Java SE 9, Java SE 10, and later
Built-in.
Part of the standard Java API with a bundled implementation.
Java 9 adds some minor features and fixes.
Java ...
How to select only the records with the highest date in LINQ
... .FirstOrDefault();
Also have a look this great LINQ place - LINQ to SQL Samples
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Using Linq to get the last N elements of a collection?
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+1, as this works in Linq to Entities/SQL. I'm guessing it's also more performant in Linq to Objects than James Curran's strategy.
– StriplingWarrior
Aug 10 '10 at 20:57
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Using CSS to insert text
... to display content. It could end up generating css dynamically base on an sql query. I would replace the selector by div[data-employeename]:before.
– Johnny5
Jan 8 '14 at 20:17
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Linear Regression and group by in R
...s not seem very R-like, however. In SAS I would do a 'by' statement and in SQL I would do a 'group by'. What's the R way of doing this?
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How do you delete an ActiveRecord object?
... runs callbacks, so before it deletes anything, it loads records. It's two SQL statements not one. Aside from the performance implications, this has concurrency implications too. The safer call skips callbacks; User.delete_all() will issue just a single DELETE FROM... command.
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Multiple select statements in Single query
I am generating a report in php (mysql),
6 Answers
6
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How does a “stack overflow” occur and how do you prevent it?
...e and server stack you're using. It is possible to blow the stack on your SQL server, for instance.
-Adam
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How to add one day to a date? [duplicate]
...er compliant with JDBC 4.2 or later. No need for strings, no need for java.sql.* classes.
Where to obtain the java.time classes?
Java SE 8, Java SE 9, Java SE 10, and later
Built-in.
Part of the standard Java API with a bundled implementation.
Java 9 adds some minor features and fixes.
Java ...