MYSQL 查询表列数
select count(*) from information_schema.columns where table_schema='db' and table_name='tb'
db是表所在的数据库名称,tb是要查询的表名
select count(*) from information_schema.columns where table_schema='db' and table_name='tb'
db是表所在的数据库名称,tb是要查询的表名