c中如何定义空数组

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select * from tbl_Articles WHERE ArticleID=2577777 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2577777 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2577777 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1649432,1383819,1076936,1939660,2200448,1062928,2246494,1888747,1063799,621465,1376370,1048560,2455033,521913,1080375,1126690,913260,1118439,1102300,1987405,2102554,163123,1076135,1073276,1302660,569962,1872052,265822,2280814,1102608) ORDER BY field (ArticleID,1649432,1383819,1076936,1939660,2200448,1062928,2246494,1888747,1063799,621465,1376370,1048560,2455033,521913,1080375,1126690,913260,1118439,1102300,1987405,2102554,163123,1076135,1073276,1302660,569962,1872052,265822,2280814,1102608)