大约有 46,000 项符合查询结果(耗时:0.0217秒) [XML]

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How do I do top 1 in Oracle?

... If you want just a first selected row, you can: select fname from MyTbl where rownum = 1 You can also use analytic functions to order and take the top x: select max(fname) over (rank() order by some_factor) from MyTbl ...
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How can I select rows with most recent timestamp for each key value?

...r data. Each row has a sensor id, a timestamp, and other fields. I want to select a single row with latest timestamp for each sensor, including some of the other fields. ...
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Removing rounded corners from a element in Chrome/Webkit

...sheet for Chrome gives a border-radius of 5px to all the corners of a <select> element. I've tried getting rid of this by applying a radius of 0px through my external stylesheet, as well inline on the element itself; I've tried both border-radius:0px and -webkit-border-radius:0px; and I...
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How to Join to first row

... SELECT Orders.OrderNumber, LineItems.Quantity, LineItems.Description FROM Orders JOIN LineItems ON LineItems.LineItemGUID = ( SELECT TOP 1 LineItemGUID FROM LineItems W...
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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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Remove border radius from Select tag in bootstrap 3

...s gone, you have to add back in the arrow that visually differentiates the select from the input. Note: appearance is not supported in IE. Working example: https://jsfiddle.net/gs2q1c7p/ select:not([multiple]) { -webkit-appearance: none; -moz-appearance: none; background-positio...
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Fastest way to determine if record exists

... SELECT TOP 1 products.id FROM products WHERE products.id = ?; will outperform all of your suggestions as it will terminate execution after it finds the first record. ...
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SQL join: selecting the last records in a one-to-many relationship

... want to get a list of all customers along with their last purchase in one SELECT statement. What is the best practice? Any advice on building indexes? ...
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Oracle SQL Query for listing all Schemas in a DB

... Using sqlplus sqlplus / as sysdba run: SELECT * FROM dba_users Should you only want the usernames do the following: SELECT username FROM dba_users share | ...
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How to search a string in multiple files and return the names of files in Powershell?

...location of the files that contain your pattern: Get-ChildItem -Recurse | Select-String "dummy" -List | Select Path share | improve this answer | follow | ...