大约有 46,000 项符合查询结果(耗时:0.0320秒) [XML]

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Combining “LIKE” and “IN” for SQL Server [duplicate]

... Effectively, the IN statement creates a series of OR statements... so SELECT * FROM table WHERE column IN (1, 2, 3) Is effectively SELECT * FROM table WHERE column = 1 OR column = 2 OR column = 3 And sadly, that is the route you'll have to take with your LIKE statements SELECT * FROM tabl...
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Number of rows affected by an UPDATE in PL/SQL

... block, this can be achieved. ... If anyone has a solution to use it in a SELECT Command, I would be interested. share | improve this answer | follow | ...
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Linq code to select one item

I find myself writing a lot of code like this to select one item that matches 7 Answers ...
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SQL variable to hold list of integers

...e @listOfIDs table (id int); insert @listOfIDs(id) values(1),(2),(3); select * from TabA where TabA.ID in (select id from @listOfIDs) or declare @listOfIDs varchar(1000); SET @listOfIDs = ',1,2,3,'; --in this solution need put coma on begin and end select * from TabA where charindex(',' + C...
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How important is the order of columns in indexes?

I've heard that you should put columns that will be the most selective at the beginning of the index declaration. Example: ...
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Fastest Way to Find Distance Between Two Lat/Long Points

...ate a SPATIAL index on these points Use MBRContains() to find the values: SELECT * FROM table WHERE MBRContains(LineFromText(CONCAT( '(' , @lon + 10 / ( 111.1 / cos(RADIANS(@lon))) , ' ' , @lat + 10 / 111.1 , ',' , @lon - 10 / ( 111.1 / cos(RADI...
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What is the difference between JOIN and UNION?

...t -- completely different operations. Trivial example of UNION: mysql> SELECT 23 AS bah -> UNION -> SELECT 45 AS bah; +-----+ | bah | +-----+ | 23 | | 45 | +-----+ 2 rows in set (0.00 sec) similary trivial example of JOIN: mysql> SELECT * FROM -> (SELECT 23 AS bah...
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Grouped LIMIT in PostgreSQL: show the first N rows for each group?

... New solution (PostgreSQL 8.4) SELECT * FROM ( SELECT ROW_NUMBER() OVER (PARTITION BY section_id ORDER BY name) AS r, t.* FROM xxx t) x WHERE x.r <= 2; sha...
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jQuery - setting the selected value of a select control via its text description

I have a select control, and in a javascript variable I have a text string. 21 Answers ...
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How do I view the full content of a text or varchar(MAX) column in SQL Server 2008 Management Studio

...ta. DECLARE @S varchar(max) = 'A' SET @S = REPLICATE(@S,100000) + 'B' SELECT @S as [XML_F52E2B61-18A1-11d1-B105-00805F49916B] In SSMS (at least versions 2012 to current of 18.3) this displays the results as below Clicking on it opens the full results in the XML viewer. Scrolling to the rig...