location join.Then,the results are gathered by the leader.SELECT/*+PARALLEL(t1)PARALLEL(t2)PQ_DISTRIBUTE(t2 PQ_GATHER PQ_GATHER)*/*FROM t as t1 STRAIGHT_JOIN t as t2 on t1.b=t2.c;The t1 table is scanned in parallel,and the...
SELECT t1.id,t2.id FROM tj_shop AS t1 LEFT JOIN tj_item AS t2 ON t1.id=t2.id 说明 如果右表值不唯一，建议不要连续使用过多 left join，以免在JOIN过程中产生数据膨胀 Inner Join：内连接。关键字 inner 可以省略。返回满足ON条件的行...
DELETE t1,t2 FROM t1 INNER JOIN t2 INNER JOIN t3 WHERE t1.id=t2.id AND t2.id=t3.name LIMIT 10001;DELETE FROM t1,t2 USING t1 INNER JOIN t2 INNER JOIN t3 WHERE t1.id=t2.id AND t2.id=t3.name LIMIT 10001;Note The shard key of ...
You can use the UPDATE syntax to modify the rows that meet the conditions in tables....UPDATE t1,t2 SET t1.name=t2.name WHERE t1.id=t2.name LIMIT 10001;Note The shard key of t1 and t2 is ID.References UPDATE syntax for MySQL
You can use parentheses()to change the calculation sequence of these operators.For example,the following statement finds the union of T1 and T2,and then the intersection of the union and T3.(select*from t1 union select*...
Example 2:ANY or ALL mutual exclusive type conflict Scenarios ANY and ALL,=ALL ANY and ALL,=ALL SELECT*FROM t1 WHERE t1.c1 ANY(SELECT c1 FROM t2 WHERE c1 10 AND c2 1)AND t1.c1 ALL(SELECT c1 FROM t2 WHERE c1 10);The AND ...
Query the value of the group_concat_max_len parameter of the current session.select group_concat(distinct concat_ws(' ',t1.col0,t1.col2,t1.col3,t1.col4)separator"-")from grp_con_test t1,grp_con_test t2 \G-Query the return ...
Query the value of the group_concat_max_len parameter of the current session.select group_concat(distinct concat_ws(' ',t1.col0,t1.col2,t1.col3,t1.col4)separator"-")from grp_con_test t1,grp_con_test t2 \G-Query the return ...
Sample result:SELECT f1 FROM(SELECT(SELECT f1 FROM t1 LIMIT 1)AS f1 FROM t1 UNION SELECT f2 FROM t2 WHERE f2=1)dt WHERE f1=1;Example 3:SELECT*FROM(SELECT f1,f2 FROM t1)dt GROUP BY f1 HAVING f1 3 AND f2 11 AND MAX(f3)12;...
IMCIs are added for all columns in the t1 and t2 tables.Obtain the DDL statement used to create an IMCI for specified columns.call dbms_imci.columnar_advise_by_columns('select count(t1.a)from t1 inner join t2 on t1.a=t2.a ...
scan('t1',real_table=("t1_00","t1_01"))*/COUNT(1)FROM t1 PolarDB-X routes the SQL statement to the t1_00 and t1_01 table shards in all database shards.After the SQL statement is executed,PolarDB-X merges the result sets ...
scan('t1',real_table=("t1_00","t1_01"))*/COUNT(1)FROM t1 When the SQL statement is executed,DRDS routes the SQL statement to table shards t1_00 and t1_01 in all database shards.After the SQL statement is executed,DRDS ...
Call the stored procedure to check whether the IMCI is valid for all columns in the SQL statement.The SQL statement uses columns in the t1 and t2 ...index('select count(t1.a)from t1 inner join t2 on t1.a=t2.a group by t1.b')...
MAX(t2.`fid`)AS `fid_max_1570691151`,MIN(t2.`fid`)AS `fid_min_1570691151` FROM WB_BestPractice_dev.`pytable` t2 GROUP BY t2.`name`)t3 ON t1.`name`=t3.`name` Instance ID:20191010070551756gtf14f72 name id fid 0 name1 4 1....
t2.id FROM tj_shop AS t1 JOIN tj_item AS t2 ON t1.id=t2.id You can set the ON condition to TRUE.If you set the condition to TRUE,the system returns the Cartesian products that the system calculates based on the number of ...
t1,t2,and t are calculated by using the following formulas:t1=(Curtime-Last_modified)×0.1=60,t2=max(10,t1)=60,and t=min(t2,3600)=60.Therefore,the TTL value is 60 seconds.If the Last-Modified value of an object is 20140801...
partitionCol2=2,.Examples:Delete cached data of the db1.t2 table from local disks.jindo table-cache-t db1.t2 Delete cached data of the db1.t1 table from local disks.jindo table-uncache-t db1.t1-p date=2020-03-16,category=1...
partitionCol2=2,.Examples:Delete cached data of the db1.t2 table from local disks.jindo table-cache-t db1.t2 Delete cached data of the db1.t1 table from local disks.jindo table-uncache-t db1.t1-p date=2020-03-16,category=1...
partitionCol2=2,.Examples:Delete cached data of the db1.t2 table from local disks.jindo table-uncache-t db1.t2 Delete cached data of the db1.t1 table from local disks.jindo table-uncache-t db1.t1-p date=2020-03-16,category...
partitionCol2=2,.Examples:Delete cached data of the db1.t2 table from local disks.jindo table-cache-t db1.t2 Delete cached data of the db1.t1 table from local disks.jindo table-uncache-t db1.t1-p date=2020-03-16,category=1...
t1,and l2.After the JOIN operations are re-sorted,the JOIN operation on t2 and l2 can still be pushed down to LogicalView.explain select t2.id from t2 join t1 on t2.id=t1.id join l2 on t1.id=l2.id;Project(id="id")HashJoin...
t2.id FROM tj_shop AS t1 JOIN tj_item AS t2 ON t1.id t2.id Note:The performance of a nested-loop join is low because data bloat occurs.Note:If a table that you specify for a join is a key-value table,Pkey-Skey-value table,...
Metric A has 288(1440 minutes/5 minutes)aggregate data records on a day,which are A0,A1,A2…A287.Correspondingly,288 EWM weights can be calculated,which are W0,W1,W2…W287.The score of Metric A on a day is:Daily score of ...
EXPLAIN ANALYZE SELECT*FROM t1 JOIN t2 ON t1.id=t2.id WHERE t1.num=1 UNION ALL SELECT*FROM t1 JOIN t2 ON t1.id=t2.id WHERE t2.cnt=2 AND(t1.num!1 OR(t1.num=1)IS NULL);QUERY PLAN-Append(cost=85.48.412.26 rows=110 width=51)...
explain select count(*)from t1 join t2 on t1.id=t2.id group by t1.name,t2.name order by t1.name,t2.name;返回信息如下：Project(count(*)="count(*)")MemSort(sort="name ASC,name0 ASC")HashAgg(group="name,name0",count(*)="COUNT...
EXPLAIN ANALYZE SELECT*FROM t1 JOIN t2 ON t1.id=t2.id WHERE t1.num=1 UNION ALL SELECT*FROM t1 JOIN t2 ON t1.id=t2.id WHERE t2.cnt=2 AND(t1.num!1 OR(t1.num=1)IS NULL);QUERY PLAN-Append(cost=85.48.412.26 rows=110 width=51)...
select*from tb1 where row(id,name)=(select id,name from tb2)Subqueries cannot be used in UPDATE SET clauses.Example:UPDATE t1 SET c1=(SELECT c2 FROM t2 WHERE t1.c1=t2.c1)LIMIT 10 Additional considerations In PolarDB-X 1.0,...
partitionCol2=2,.Examples:Delete the cached data of the db1.t2 table from local disks.jindo table-uncache-t db1.t2 Delete the cached data of the db1.t1 table from local disks.jindo table-uncache-t db1.t1-p date=2020-03-16,...
partitionCol2=2,.Examples:Delete the cached data of the db1.t2 table from local disks.jindo table-cache-t db1.t2 Delete the cached data of the db1.t1 table from local disks.jindo table-uncache-t db1.t1-p date=2020-03-16,...
partitionCol2=2,.Examples:Delete the cached data of the db1.t2 table from local disks.jindo table-uncache-t db1.t2 Delete the cached data of the db1.t1 table from local disks.jindo table-uncache-t db1.t1-p date=2020-03-16,...
partitionCol2=2,.Examples:Delete the cached data of the db1.t2 table from local disks.jindo table-uncache-t db1.t2 Delete the cached data of the db1.t1 table from local disks.jindo table-uncache-t db1.t1-p date=2020-03-16,...
Parameters Parameter Description traj1 The trajectory object 1.traj2 The trajectory object 2.t1 The start time.t2 The end time.range The time range.Example Select ST_nearestApproachPoint((Select traj from traj_table where ...
Sample result:a|b|c-+-+-2|12|t1 3|13|t1 4|14|t1 7|17|t1 8|18|t1 1|11|t1 5|15|t1 6|16|t1 9|19|t1 10|20|t1(10 rows)References AnalyticDB for PostgreSQL supports the cross-instance query feature.For more information,see Query...
After optimization SELECT*FROM t1-Empty set,WHERE/HAVING clause=false,or LIMIT 0 SELECT*FROM t1 WHERE EXISTS(SELECT max(a)FROM t2 HAVING 1=2);After optimization SELECT*FROM t1 WHERE false Prepare test data:DROP TABLE IF ...
Batch execute the dbms_imci.columnar_advise()stored procedure.call dbms_imci.columnar_advise('select count(t1.a)from t1 inner join t2 on t1.a=t2.a group by t1.b');call dbms_imci.columnar_advise('select count(t1.a)from t1 ...
This function returns the nearest distance between trajectory objects 1 and 2 within the specified time range.Syntax float8 ST_nearestApproachDistance(trajectory traj,trajectory traj2);float8 ST_nearestApproachDistance...