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						The efficiency problem of inserting a unique random string into Mysql by PHP
						
 there is a CAPTCHA data table with 2 million pieces of data. CAPTCHA fields need to be unique 
 you need to insert a large amount of data into this table, about tens of thousands of pieces of data at a time 
 how to optimize the execution time of each ... 
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						What should I do if I want to randomly pick out five different colors and numbers of playing cards?
						
 I want the program to randomly issue five cards with different colors and numbers (it doesn  t matter if there are occasional cards with the same number), but I find that five cards are always the same. 
 import random  suites = [ "Hearts ",  "Diamonds ... 
MySQL Query :  SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5 
 MySQL Error : Disk full (/tmp/#sql-temptable-64f5-42c05c4-8a4a.MAI); waiting for someone to free some space... (errno: 28 "No space left on device") 
 MySQL Errno : 1021 
 Message :  Disk full (/tmp/#sql-temptable-64f5-42c05c4-8a4a.MAI); waiting for someone to free some space... (errno: 28 "No space left on device") 
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