大约有 9,780 项符合查询结果(耗时:0.0123秒) [XML]

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How to use GROUP BY to concatenate strings in SQL Server?

...S (1,'B',8) INSERT INTO #YourTable ([ID],[Name],[Value]) VALUES (2,'C',9) SELECT [ID], STUFF(( SELECT ', ' + [Name] + ':' + CAST([Value] AS VARCHAR(MAX)) FROM #YourTable WHERE (ID = Results.ID) FOR XML PATH(''),TYPE).value('(./text())[1]','VARCHAR(MAX)') ,1,2,'') AS NameVa...
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How to best display in Terminal a MySQL SELECT returning too many fields?

... Terminate the query with \G in place of ;. For example: SELECT * FROM sometable\G This query displays the rows vertically, like this: *************************** 1. row *************************** Host: localhost Db: mydatabase1 ...
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How to subtract 30 days from the current datetime in mysql?

... SELECT * FROM table WHERE exec_datetime BETWEEN DATE_SUB(NOW(), INTERVAL 30 DAY) AND NOW(); http://dev.mysql.com/doc/refman/5.5/en/date-and-time-functions.html#function_date-add ...
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Linq: What is the difference between Select and Where

The Select and Where methods are available in Linq. What should every developer know about these two methods? For example: when to use one over the other, any advantages of using one over the other, etc. ...
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Return rows in random order [duplicate]

... SELECT * FROM table ORDER BY NEWID() share | improve this answer | follow | ...
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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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SQL - using alias in Group By

... following order: FROM clause WHERE clause GROUP BY clause HAVING clause SELECT clause ORDER BY clause For most relational database systems, this order explains which names (columns or aliases) are valid because they must have been introduced in a previous step. So in Oracle and SQL Server, you...
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SQL: How to properly check if a record exists

... It's better to use either of the following: -- Method 1. SELECT 1 FROM table_name WHERE unique_key = value; -- Method 2. SELECT COUNT(1) FROM table_name WHERE unique_key = value; The first alternative should give you no result or one result, the second count should be zero or on...
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Is there any difference between GROUP BY and DISTINCT

...CT and distinct by UNION cause an oracle error, but GROUP BY worked; I was selecting only 1 column from a view and not using any aggregation; I'm still baffled why it required it, but it does confirm there is some difference in the execution. As others point out, it also lets you GROUP BY columns no...
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'IF' in 'SELECT' statement - choose output value based on column values

... SELECT id, IF(type = 'P', amount, amount * -1) as amount FROM report See http://dev.mysql.com/doc/refman/5.0/en/control-flow-functions.html. Additionally, you could handle when the condition is null. In the case of...