加法结合律介绍

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select * from tbl_Articles WHERE ArticleID=1528553 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1528553 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1528553 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(606898,553601,441191,1172639,404351,777513,2110088,704381,509312,1149644,463857,1012207,679624,769884,531994,519457,450989,2069919,1355687,2324155,1936797,963573,1063290,907486,1176455,681062,373843,706669,833460,606580) ORDER BY field (ArticleID,606898,553601,441191,1172639,404351,777513,2110088,704381,509312,1149644,463857,1012207,679624,769884,531994,519457,450989,2069919,1355687,2324155,1936797,963573,1063290,907486,1176455,681062,373843,706669,833460,606580)