大约有 44,000 项符合查询结果(耗时:0.0232秒) [XML]

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MySQL: determine which database is selected?

After calling mysql_select_db to grab a database, is there any way to later output the name of the database that is currently selected? This seems very basic but I couldn't find anything on php.net or stackoverflow (all results are for "no database selected"). ...
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How to use DISTINCT and ORDER BY in same SELECT statement?

..., and use a GROUP BY to make the DISTINCT work. Try something like this: SELECT DISTINCT Category, MAX(CreationDate) FROM MonitoringJob GROUP BY Category ORDER BY MAX(CreationDate) DESC, Category share | ...
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How to get sp_executesql result into a variable?

... DECLARE @ParmDefinition nvarchar(500); DECLARE @tablename nvarchar(50) SELECT @tablename = N'products' SELECT @sSQL = N'SELECT @retvalOUT = MAX(ID) FROM ' + @tablename; SET @ParmDefinition = N'@retvalOUT int OUTPUT'; EXEC sp_executesql @sSQL, @ParmDefinition, @retvalOUT=@retval OUTPUT; SE...
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How to remove the default arrow icon from a dropdown list (select element)?

I want to remove the dropdown arrow from a HTML <select> element. For example: 12 Answers ...
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PadLeft function in T-SQL

... I believe this may be what your looking for: SELECT padded_id = REPLACE(STR(id, 4), SPACE(1), '0') FROM tableA or SELECT REPLACE(STR(id, 4), SPACE(1), '0') AS [padded_id] FROM tableA I haven't tested the syntax on the 2nd example. I'm not sure if that works 100%...
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Can you have if-then-else logic in SQL? [duplicate]

I need to do select data from a table based on some kind of priority like so: 7 Answers ...
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Converting Select results into Insert script - SQL Server [closed]

...asier than installing plugins or external tools in some situations: Do a select [whatever you need]INTO temp.table_namefrom [... etc ...]. Right-click on the database in the Object Explorer => Tasks => Generate Scripts Select temp.table_name in the "Choose Objects" screen, click Next. In the...
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What is the simplest SQL Query to find the second largest value?

... SELECT MAX( col ) FROM table WHERE col < ( SELECT MAX( col ) FROM table ) share | improve this answ...
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Select first row in each GROUP BY group?

As the title suggests, I'd like to select the first row of each set of rows grouped with a GROUP BY . 17 Answers ...
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How do SQL EXISTS statements work?

... criteria -- this is why it can be faster than IN. Also be aware that the SELECT clause in an EXISTS is ignored - IE: SELECT s.* FROM SUPPLIERS s WHERE EXISTS (SELECT 1/0 FROM ORDERS o WHERE o.supplier_id = s.supplier_id) ...should hit a division by zero error...