SETTINGS materialized_mysql_tables_list='user_table,catalog_sales'TABLE OVERRIDE user_table( COLUMNS ( userid UUID, category LowCardinality(String), timestamp DateTime C... allows_query_when_mysql_lost=1,include_tables='user,data'TABLE OVERRIDE data( PARTITION BY toYYYYMMDD(date_time)) ; ```参数解释:- shard_mode:true 表示是同步至分布式表。- allows_query_whe...
sum(value) AS sum_value, ...... FROM (SELECT event_date,hash_uid AS uc1,sum(et.float_params{'amount'}) AS value, count(1) AS cnt, value*cnt AS multiple FROM ... 我们使用中有一个复杂的case,用户表过滤条件不下推有1千万+,SQL执行了3000秒依然执行超时,而做了下推之后60秒内就执行成功了。![picture.image](https://p6-volc-community-sign.byteimg.com/tos-cn-i-tlddhu...
**●** 将当前数据处理阶段提升到 WithMergeableState; **2.执行阶段****●** MergeTreeDataSelectExecutor 会将 aggregate 之前的计算进行拆分:对于 normal part,使用原查询计划进行计算;对于 proje... `sum(action_duration)` `FROM tea_data.events` `WHERE event_date = '2023-05-29'` `GROUP BY` `app_id,` `user_id` ``` 在执行计划阶段优化器尽量的将 TableScan 上层的 Partial...
WithNames"; done# 检查数据是否导入成功$ clickhouse-client$ SELECT count() FROM test.opensky;```### 测试场景#### MySQL```plsql$ mysql -uroot -p123456$ use test;-- 开启性能分析set profiling = 1;-- 查询磁盘空间select table_rows as `总行数`, (data_length + index_length)/1024/1024/1024 as `磁盘占用(G)` from information_schema.`TABLES` where table_name = 'opensky';-- 全表countselect c...
password --catalog hive2.3 使用 PrestoSQL 查询 Hudi可以直接使用上文 SparkSQL 导入的样例表进行查询。 sql use default;show tables;SELECT l_returnflag, l_linestatus, sum(l_quantity) as sum_qty, sum(l_extendedprice) as sum_base_price, sum(l_extendedprice * (1 - l_discount)) as sum_disc_price, sum(l_extendedprice * (1 - l_discount) * (1 + l_tax)) as sum_charge, avg(l_quantity) ...
这个列的聚合方法是求和(SUM)。 建表语句如下: sql CREATE TABLE table1( siteid INT DEFAULT '10', citycode SMALLINT, username VARCHAR(32) DEFAULT '', pv BIGINT SUM DEFAULT '0')AGGREGATE KEY... 可以查看 example_db 中表的信息: sql MySQL> SHOW TABLES;+----------------------+ Tables_in_example_db +----------------------+ table1 table2 +----------------------+2 row...
这个列的聚合方法是求和(SUM) 建表语句如下: sql CREATE TABLE table1( siteid INT DEFAULT '10', citycode SMALLINT, username VARCHAR(32) DEFAULT '', pv BIGINT SUM DEFAULT '0')AGGREGATE KEY(... 可以查看 example_db 中表的信息: sql MySQL> SHOW TABLES;+----------------------+ Tables_in_example_db +----------------------+ table1 table2 +----------------------+2 row...
**●** 将当前数据处理阶段提升到 WithMergeableState; **2.执行阶段****●** MergeTreeDataSelectExecutor 会将 aggregate 之前的计算进行拆分:对于 normal part,使用原查询计划进行计算;对于 proje... `sum(action_duration)` `FROM tea_data.events` `WHERE event_date = '2023-05-29'` `GROUP BY` `app_id,` `user_id` ``` 在执行计划阶段优化器尽量的将 TableScan 上层的 Partial...
WithNames"; done# 检查数据是否导入成功$ clickhouse-client$ SELECT count() FROM test.opensky;```### 测试场景#### MySQL```plsql$ mysql -uroot -p123456$ use test;-- 开启性能分析set profiling = 1;-- 查询磁盘空间select table_rows as `总行数`, (data_length + index_length)/1024/1024/1024 as `磁盘占用(G)` from information_schema.`TABLES` where table_name = 'opensky';-- 全表countselect c...
Multiple ports should be splited by ','. eg. 3306,3307 this option has no effect when -f is set. -r port range, Don't use -r and -p at the same time -l query log DIREC... mysql> show tables;+------------------+| Tables_in_rudonx |+------------------+| gk_37 || rudonx || t1 || t11 || test |+---------...
Multiple ports should be splited by ','. eg. 3306,3307 this option has no effect when -f is set. -r port range, Don't use -r and -p at the same time -l query log DIREC... mysql> show tables;+------------------+| Tables_in_rudonx |+------------------+| gk_37 || rudonx || t1 || t11 || test |+---------...
when dividing a minimal negative number by minus one. Syntax sql intDivOrZero(a, b)Arguments a – The number. b – The number. Returned value Quotient of the numbers in integer Example sql SELECT intDivOrZero(10, -2);Result: plain%20text ┌─intDivOrZero(10, -2)─┐│ -5 │└──────────────────────┘lcmReturns the least common multiple of the numbers. An ex...
case, cast, catalog_name, chain, change, changed, channel, char, character, charset, check, checksum, cipher, class_origin, client, close, coalesce, code, collate, collation, column, column_format,... table_checksum, table_name, tables, tablespace, temporary, temptable, terminated, text, than, then, time, timestamp, timestampadd, timestampdiff, tinyblob, tinyint, tinytext, to, trailing, transact...