标签:from sel rom -- val back field select style
查询
查询不能只查tag标签,一定要加上fields。
如:select val,"班组" FROM "测试表" WHERE dev = ‘cs123‘ and time> now() - 20m
直接写:select "班组" FROM "测试表" WHERE dev = ‘cs123‘ and time> now() - 20m ,数据库不会显示数据。
标签:from sel rom -- val back field select style
原文地址:http://www.cnblogs.com/michellexiaoqi/p/7338913.html