php中三个等于号是什么意思

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select * from tbl_Articles WHERE ArticleID=1371188 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1371188 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1371188 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1414986,1071607,2391262,1063559,1070939,1077984,2477785,1071203,1677000,2252879,2414555,1068874,1132037,1075503,1056536,1062646,1076059,2058894,1731318,2595058,1118338,1132843,1094875,1783505,2728130,1049062,2496597,1063191,2301764,1101957) ORDER BY field (ArticleID,1414986,1071607,2391262,1063559,1070939,1077984,2477785,1071203,1677000,2252879,2414555,1068874,1132037,1075503,1056536,1062646,1076059,2058894,1731318,2595058,1118338,1132843,1094875,1783505,2728130,1049062,2496597,1063191,2301764,1101957)