Turn to for help in SQL every 30 take a data line how to write-CodePudding

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Turn to for help in SQL every 30 take a data line how to write

Time：09-16

SQL server in the data acquisition cycle is 3 minutes at a time, have a lot of data every day,
Want every 30 in web page display or interval time 30, 60 points on the web page display
Could you tell me how to write bosses this to
Save the children

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