怎样理解自动投案

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select * from tbl_Articles WHERE ArticleID=2123354 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2123354 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2123354 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(530762,1504929,118105,3199386,2684112,1848133,2634657,2238891,345869,1131991,111422,112163,1085062,1847444,111539,2204600,122796,1839045,112274,1284451,115486,1431609,153563,120552,2835836,2112590,118390,2070696,136034,2425579) ORDER BY field (ArticleID,530762,1504929,118105,3199386,2684112,1848133,2634657,2238891,345869,1131991,111422,112163,1085062,1847444,111539,2204600,122796,1839045,112274,1284451,115486,1431609,153563,120552,2835836,2112590,118390,2070696,136034,2425579)