程序异常如下:Caused by: com.datastax.driver.core.exceptions.WriteTimeoutException: Cassandra timeout during write query at consistency LOCAL_ONE (1 replica were required but only 0 acknowledged the write
小表驱动大表,也就是说用小表的数据集驱动大表的数据集。假如有order和user两张表,其中order表有10000条数据,而user表有100条数据。 这时如果想查一下,所有有效的用户下过的订单列表。可以使用in关键字实现: select * from orderwhere user_id in (select id from user where status=1) 也可以使用ex
问题SQL: select p.person_id as personId, p.person_name as personName, p.native_place as nativePlace, ci.company_name as companyName, pp.seal_number as sealNumber, GROUP_CONCAT(pp.major) as major, pp.re