SELECT declare_type_id,support_model,project_name,CONCAT(declare_type_id,support_model,project_name) from gf_index；
mysql 将多列合并为一列
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转载自www.cnblogs.com/yyhhblog/p/12181441.html
周排行
SELECT declare_type_id,support_model,project_name,CONCAT(declare_type_id,support_model,project_name) from gf_index；