大约有 40,000 项符合查询结果(耗时:0.0191秒) [XML]

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Group query results by month and year in postgresql

... select to_char(date,'Mon') as mon, extract(year from date) as yyyy, sum("Sales") as "Sales" from yourtable group by 1,2 At the request of Radu, I will explain that query: to_char(date,'Mon') as mon, : convert...
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Count the number of occurrences of a string in a VARCHAR field?

... This should do the trick: SELECT title, description, ROUND ( ( LENGTH(description) - LENGTH( REPLACE ( description, "value", "") ) ) / LENGTH("value") ) AS count FROM <tab...
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PostgreSQL: Difference between text and varchar (character varying)

... article does detailed testing to show that the performance of inserts and selects for all 4 data types are similar. It also takes a detailed look at alternate ways on constraining the length when needed. Function based constraints or domains provide the advantage of instant increase of the length c...
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GetProperties() to return all properties for an interface inheritance hierarchy

...(new Type[] { type }) .Concat(type.GetInterfaces()) .SelectMany(i => i.GetProperties()); } share | improve this answer | follow | ...
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How do you convert a byte array to a hexadecimal string, and vice versa?

... } return result; } static uint[] _Lookup32 = Enumerable.Range(0, 255).Select(i => { string s = i.ToString("X2"); return ((uint)s[0]) + ((uint)s[1] << 16); }).ToArray(); static string ByteArrayToHexViaLookupPerByte(byte[] bytes) { var result = new char[bytes.Length * 2]; ...
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Initializing a static std::map in C++

... This is a fantastic answer. It's a shame the OP never selected one. You deserve mega props. – Thomas Thorogood Sep 26 '12 at 18:26 ...
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is it possible to select EXISTS directly as a bit?

...workaround. If you must return a conditional bit 0/1 another way is to: SELECT CAST( CASE WHEN EXISTS(SELECT * FROM theTable where theColumn like 'theValue%') THEN 1 ELSE 0 END AS BIT) Or without the cast: SELECT CASE WHEN EXISTS( SELECT 1 FROM theTable WHERE theColumn LI...
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Capitalize first letter. MySQL

... You can use a combination of UCASE(), MID() and CONCAT(): SELECT CONCAT(UCASE(MID(name,1,1)),MID(name,2)) AS name FROM names; share | improve this answer | ...
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How to extract year and month from date in PostgreSQL without using to_char() function?

I want to select sql: SELECT "year-month" from table group by "year-month" AND order by date , where year-month - format for date "1978-01","1923-12". select to_char of couse work , but not "right" order: ...
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MFC CListCtrl使用方法详解 - C/C++ - 清泛网 - 专注C/C++及内核技术

...DWORD dwStyle = m_list.GetExtendedStyle(); dwStyle |= LVS_EX_FULLROWSELECT;//选中某行使整行高亮(只适用与report风格的listctrl) dwStyle |= LVS_EX_GRIDLINES;//网格线(只适用与report风格的listctrl) dwStyle |= LVS_EX_CHECKBOXES;//item前生成checkbox...