查詢庫下面的表的文件大小已mysql庫爲例
select
TABLE_NAME,
concat(truncate(data_length/1024/1024,2),' MB') as data_size,
concat(truncate(index_length/1024/1024,2),' MB') as index_size
from information_schema.tables
where TABLE_SCHEMA = 'mysql'
group by TABLE_NAME
order by data_length desc;
統計mysql 重複數據已name字段爲例
select name ,count() as count from zipkin_spans group by name having count >1;
統計mysql表的數據總數
select count（） from zipkin_spans；
查看mysql前10條數據
select from tablename limit 10；
mysql字段模糊查詢name字段
select from tablename where name like ‘%zhang’;
模糊查詢統計數
select count（name） tablename where name like ‘%zhang’；
查看建表語句表明si
show create table si;