三角形一边的中线如何求

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SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1112032,1081959,1105543,1078791,1066498,1085842,1069922,1064061,1072365,1072278,1094817,1095257,1112730,1068214,1047637,1071119,1101707,1110113,995175,1065393,1092289,1104847,986336,1077976,1078318,1073088,1108051,1102437,1088694,1100013) ORDER BY field (ArticleID,1112032,1081959,1105543,1078791,1066498,1085842,1069922,1064061,1072365,1072278,1094817,1095257,1112730,1068214,1047637,1071119,1101707,1110113,995175,1065393,1092289,1104847,986336,1077976,1078318,1073088,1108051,1102437,1088694,1100013)