字符串连接运算符有哪两个?

页面:/news/view-711301/ | 耗时:0.8570 s | 内存:1.89 MB | 查询:4 | 缓存读取:4 写入:0 | 加载文件:23
select * from tbl_Articles WHERE ArticleID=711301 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=711301 LIMIT 0,1
select * from tbl_Articles_sphinx where id=711301 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1370229,1075825,1095658,1127535,1125373,1099085,1132657,1275997,1126042,1473933,1110880,1043405,1104139,1104085,1132571,1108750,1109198,1113516,1123414,1072089,1113656,1105812,1068152,1128103,1126962,1111854,1097705,1082063,1130440,1068868) ORDER BY field (ArticleID,1370229,1075825,1095658,1127535,1125373,1099085,1132657,1275997,1126042,1473933,1110880,1043405,1104139,1104085,1132571,1108750,1109198,1113516,1123414,1072089,1113656,1105812,1068152,1128103,1126962,1111854,1097705,1082063,1130440,1068868)