什么叫双冠号

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select * from tbl_Articles WHERE ArticleID=838291 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=838291 LIMIT 0,1
select * from tbl_Articles_sphinx where id=838291 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(2169942,1282775,541172,1417223,849135,1199055,1410908,1177590,1081495,1116383,379279,968645,918884,1507477,398709,659823,438610,1356866,1014650,2136010,2051956,1194931,1542542,500128,1571995,500978,692558,1401633,1132830,2078414) ORDER BY field (ArticleID,2169942,1282775,541172,1417223,849135,1199055,1410908,1177590,1081495,1116383,379279,968645,918884,1507477,398709,659823,438610,1356866,1014650,2136010,2051956,1194931,1542542,500128,1571995,500978,692558,1401633,1132830,2078414)