大约有 41,000 项符合查询结果(耗时:0.0459秒) [XML]

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How to generate a range of numbers between two numbers?

... Select non-persisted values with the VALUES keyword. Then use JOINs to generate lots and lots of combinations (can be extended to create hundreds of thousands of rows and beyond). SELECT ones.n + 10*tens.n + 100*hundreds.n +...
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MySQL Great Circle Distance (Haversine formula)

...ults. To search by kilometers instead of miles, replace 3959 with 6371. SELECT id, ( 3959 * acos( cos( radians(37) ) * cos( radians( lat ) ) * cos( radians( lng ) - radians(-122) ) + sin( radians(37) ) * sin(radians(lat)) ) ) AS distance FROM markers HAVING distance < 25 ORDER BY distance ...
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Escaping HTML strings with jQuery

... This isn't cross browser safe if your string has whitespaces and \n \r \t chars in it – nivcaner Dec 4 '10 at 17:31 20 ...
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C# using streams

...itionally, StreamReader and StreamWriter are for reading and writing TEXT (character) streams. – 1c1cle Feb 25 '15 at 1:44 1 ...
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How do I find duplicate values in a table in Oracle?

...then use a HAVING clause to find values that appear greater than one time. SELECT column_name, COUNT(column_name) FROM table_name GROUP BY column_name HAVING COUNT(column_name) > 1; share | impr...
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Get cursor position (in characters) within a text Input field

... Easier update: Use field.selectionStart example in this answer. Thanks to @commonSenseCode for pointing this out. Old answer: Found this solution. Not jquery based but there is no problem to integrate it to jquery: /* ** Returns the caret (curs...
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What is the simplest SQL Query to find the second largest value?

... SELECT MAX( col ) FROM table WHERE col < ( SELECT MAX( col ) FROM table ) share | improve this answ...
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How to delete duplicates on a MySQL table?

...n an index is going to be slow for large tables. Wouldn't it be better to SELECT MAX(ID) FROM t GROUP BY unique and then JOIN to an exact match of ID to MAX(ID)? – ebyrob Nov 10 '16 at 16:31 ...
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Calculate size of Object in Java [duplicate]

...reports "Footprint{Objects=34, References=52, Primitives=[float, int x 19, char x 257, long x 2, byte x 68557]}". ObjectGraphMeasurer is clearly the winner. – Yuci Sep 2 '16 at 11:03 ...
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MySQL ON vs USING?

...n tables ON a column, a set of columns and even a condition. For example: SELECT * FROM world.City JOIN world.Country ON (City.CountryCode = Country.Code) WHERE ... USING is useful when both tables share a column of the exact same name on which they join. In this case, one may say: SELECT ... FR...