By using INNER JOIN we will not get the records where there is not a match, we will only get the records that matches both tables:Example Join testproducts to categories using the category_id column: SELECT testproduct_id, product_name, category_name FROM testproducts INNER JOIN categories ...
Distributed tables:分片表,就是使用上述hash分片和range分片的表。 Co-located table:分片方式相同的表称为亲和表。亲和表的集合成为组,通常一个分片的运维操作,指的都是一个组内的所有亲和表。 Reference tables:参考表,每个DN上有表的全部数据,用于解决跨节点JOIN问题。 Local tables:本地表,只存在于CN上(因为...
inner join vendorh v on g.vdrgid = v.gid --and g.orggid = v.src inner join sort st1 on substr(g.sort,1,2) = st1.code inner join sort st2 on substr(g.sort,1,3) = st2.code inner join sort st3 on substr(g.sort,1,4) = st3.code inner join sort st4 on substr(g.sort...
INNER JOIN: Returns records that have matching values in both tables LEFT JOIN: Returns all records from the left table, and the matched records from the right table RIGHT JOIN: Returns all records from the right table, and the matched records from the left table ...
system tablesCREATEVIEWactive_locksASSELECTclock_timestamp(),pg_class.relname,pg_locks.locktype,pg_locks.database,pg_locks.relation,pg_locks.page,pg_locks.tuple,pg_locks.virtualtransaction,pg_locks.pid,pg_locks.mode,pg_locks.grantedFROMpg_locksJOINpg_classONpg_locks.relation=pg_class.oidWHERE...
inner join pg_stat_activity sa on a.pid=sa.procpid --3.查询某个表内,状态为lock的锁及关联的查询语句 select a.locktype,a.database,a.pid,a.mode,a.relation,b.relname -- ,sa.* from pg_locks a join pg_class b on a.relation = b.oid ...
INNER JOIN:内连接,把 table1 中的每一行与 table2 中的每一行进行比较,找到所有满足连接谓词的行的匹配对。 LEFT OUTER JOIN:左外连接 RIGHT OUTER JOIN:右外连接 FULL OUTER JOIN:全外连接 3、union:合并两个或多个 SELECT 语句的结果 4、别名
inner join 入库1 on res_quota.code=入库1.定额编号 where res_quota.status='0'; 1. 2. 3. 4. 关联两张表更新 update res_quota_condition a set remark ='0' from res_quota b where a.quota_id=b.id and b.status='0' 1. 2.
select * from info inner join depart on info.depart_id=depart.id; 1. 2. 到目前为止SQL执行语句的优先级顺序: join on where group by having order by limit 1. 2. 3. 4. 5. 6. 7. 8. 注意:不仅两张表可以连接,多张表也可以连接。
'innerjoin' || currentTableName || 't10on(t9.f9 = t10.f9)'; end if; currentTableId := currentTableId + 1; count := count + 1; if (currentTableId > numberOfTablesPerSchema) then exit; end if; end loop; currentSchemaId := currentSchemaId + 1; ...