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Is it correct to use JavaScript Array.sort() method for shuffling?
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How to make an element in XML schema optional?
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191
Try this
<xs:element name="description" type="xs:string" minOccurs="0" maxOccurs="1" />...
How much size “Null” value takes in SQL Server
I have a large table with say 10 columns. 4 of them remains null most of the times. I have a query that does null value takes any size or no size in bytes. I read few articles some of them are saying :
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How to concatenate strings of a string field in a PostgreSQL 'group by' query?
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How do you test that a Python function throws an exception?
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Append TimeStamp to a File Name
...following custom format specifiers y (year), M (month), d
(day), h (hour 12), H (hour 24), m (minute), s (second), f (second
fraction), F (second fraction, trailing zeroes are trimmed), t (P.M or
A.M) and z (time zone).
With Extension Method
Usage:
string result = "myfile.txt".AppendTimeS...
汇编语言超浓缩教程（汇编入门必备） - C/C++ - 清泛网 - 专注C/C++及内核技术
...，不同的CPU其汇编语言的指令语法亦不相同。个人电脑由1981年推出至今，其CPU发展过程为：8086→80286→80386→80486→PENTIUM →……，还有AMD、CYRIX等旁支。后面兼容前面CPU的功能，只不过多了些指令（如多能奔腾的MMX指...
MySQL join with where clause
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291
You need to put it in the join clause, not the where:
SELECT *
FROM categories
LEFT JOIN user_c...
PostgreSQL function for last inserted ID
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