大约有 47,000 项符合查询结果(耗时:0.0224秒) [XML]

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SQL Server SELECT LAST N Rows

...d database... Now let us retrieve the Last 5 orders placed by Employee 5: SELECT ORDERID, CUSTOMERID, OrderDate FROM ( SELECT ROW_NUMBER() OVER (PARTITION BY EmployeeID ORDER BY OrderDate DESC) AS OrderedDate,* FROM Orders ) as ordlist WHERE ordlist.EmployeeID = 5 AND ordlist.OrderedDate &...
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SQL - find records from one table which don't exist in another

...shortest statement, and may be quickest if your phone book is very short: SELECT * FROM Call WHERE phone_number NOT IN (SELECT phone_number FROM Phone_book) alternatively (thanks to Alterlife) SELECT * FROM Call WHERE NOT EXISTS (SELECT * FROM Phone_book WHERE Phone_book.phon...
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Rails select helper - Default selected value, how?

... This should do it: <%= f.select :project_id, @project_select, :selected => params[:pid] %> share | improve this answer | ...
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NOT IN vs NOT EXISTS

...llow NULLs the NOT IN will be treated identically to the following query. SELECT ProductID, ProductName FROM Products p WHERE NOT EXISTS (SELECT * FROM [Order Details] od WHERE p.ProductId = od.ProductId) The exact plan may vary but for my examp...
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Select text on input focus

I have a text input. When the input receives focus I want to select the text inside of the input. 10 Answers ...
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postgresql: INSERT INTO … (SELECT * …)

...ostgres CREATE TABLE tblA (id serial, time integer); INSERT INTO tblA SELECT id, time FROM dblink('dbname=dbtest', 'SELECT id, time FROM tblB') AS t(id integer, time integer) WHERE time > 1000; TABLE tblA; id | time ----+------ 1 | 5000 2 | 2000 (2 rows) PostgreSQL has ...
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Set the selected index of a Dropdown using jQuery

... First of all - that selector is pretty slow. It will scan every DOM element looking for the ids. It will be less of a performance hit if you can assign a class to the element. $(".myselect") To answer your question though, there are a few w...
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How do I use variables in Oracle SQL Developer?

... other stuff didn't work for me, but this did: define value1 = 'sysdate' SELECT &&value1 from dual; Also it's the slickest way presented here, yet. (If you omit the "define"-part you'll be prompted for that value) ...
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What are the differences between poll and select?

I am referring to the POSIX standard select and poll system C API calls. 3 Answers ...
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What's a quick way to comment/uncomment lines in Vim?

... For those tasks I use most of the time block selection. Put your cursor on the first # character, press CtrlV (or CtrlQ for gVim), and go down until the last commented line and press x, that will delete all the # characters vertically. For commenting a block of text i...