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MySQL select 10 random rows from 600K rows fast

How can I best write a query that selects 10 rows randomly from a total of 600k? 26 Answers ...
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Is it possible to specify condition in Count()?

...an use the fact that the count aggregate only counts the non-null values: select count(case Position when 'Manager' then 1 else null end) from ... You can also use the sum aggregate in a similar way: select sum(case Position when 'Manager' then 1 else 0 end) from ... ...
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How to calculate age (in years) based on Date of Birth and getDate()

...low: try this: DECLARE @dob datetime SET @dob='1992-01-09 00:00:00' SELECT DATEDIFF(hour,@dob,GETDATE())/8766.0 AS AgeYearsDecimal ,CONVERT(int,ROUND(DATEDIFF(hour,@dob,GETDATE())/8766.0,0)) AS AgeYearsIntRound ,DATEDIFF(hour,@dob,GETDATE())/8766 AS AgeYearsIntTrunc OUTPUT: Age...
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MySQL “Group By” and “Order By”

I want to be able to select a bunch of rows from a table of e-mails and group them by the from sender. My query looks like this: ...
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Select columns from result set of stored procedure

...stored procedure that returns 80 columns, and 300 rows. I want to write a select that gets 2 of those columns. Something like ...
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Search for selection in vim

... Check this Vim tip: Search for visually selected text Or you can simply yank the selected text with y and go to search mode /, then you can paste the last yanked text with Ctrl+R 0 share ...
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SQL Server loop - how do I loop through a set of records

how do I loop through a set of records from a select? 8 Answers 8 ...
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How to add extra info to copied web text

...cument.location.href}`; event.clipboardData.setData('text', document.getSelection() + pagelink); event.preventDefault(); }); Lorem ipsum dolor sit amet, consectetur adipiscing elit.<br/> <textarea name="textarea" rows="7" cols="50" placeholder="paste your copied text here"></...
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Insert all values of a table into another table in SQL

.... But the insert statement accepts values, but i would like it to accept a select * from the initial_Table. Is this possible? ...
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html select option separator

How do you make a separator in a select tag? 14 Answers 14 ...