大约有 47,000 项符合查询结果(耗时:0.0354秒) [XML]

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Selecting element by data attribute

Is there an easy and straight-forward method to select elements based on their data attribute? For example, select all anchors that has data attribute named customerID which has value of 22 . ...
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How can I add an item to a SelectList in ASP.net MVC

Basically I am looking to insert an item at the beginning of a SelectList with the default value of 0 and the Text Value of " -- Select One --" ...
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How to get all Errors from ASP.Net MVC modelState?

... Using LINQ: IEnumerable<ModelError> allErrors = ModelState.Values.SelectMany(v => v.Errors); share | improve this answer | follow | ...
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How do I list all the columns in a table?

... For Oracle (PL/SQL) SELECT column_name FROM user_tab_cols WHERE table_name = 'myTableName' For MySQL SHOW COLUMNS FROM table_name share | i...
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How do I obtain a Query Execution Plan in SQL Server?

...ution plan in SQL Server Management Studio, or right click on the plan and select "Save Execution Plan As ..." to save the plan to a file in XML format. Method 2 - Using SHOWPLAN options This method is very similar to method 1 (in fact this is what SQL Server Management Studio does internally), ho...
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How do I escape a reserved word in Oracle?

In TSQL I could use something like Select [table] from tablename to select a column named "table". 5 Answers ...
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NULL values inside NOT IN clause

... Query A is the same as: select 'true' where 3 = 1 or 3 = 2 or 3 = 3 or 3 = null Since 3 = 3 is true, you get a result. Query B is the same as: select 'true' where 3 <> 1 and 3 <> 2 and 3 <> null When ansi_nulls is on, 3 <&...
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SQL: deleting tables with prefix

...r you: In the MySQL shell or through PHPMyAdmin, use the following query SELECT CONCAT( 'DROP TABLE ', GROUP_CONCAT(table_name) , ';' ) AS statement FROM information_schema.tables WHERE table_name LIKE 'myprefix_%'; This will generate a DROP statement which you can than copy and execut...
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“Large data” work flows using pandas

...ns? What will typical operations look like. E.g. do a query on columns to select a bunch of rows and specific columns, then do an operation (in-memory), create new columns, save these. (Giving a toy example could enable us to offer more specific recommendations.) After that processing, then what do...
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How to detect when cancel is clicked on file input?

...s not exposed to the browser." This is not true if the dialog is closed by selecting a file. – Trevor Dec 1 '16 at 22:24 ...