使用指南ROWNUM可以在DML查询语句中使用，可以出现在SELECT LIST、WHERE、HAVING、ORDER BY以及GROUP BY等位置，也可以在CTE和子查询中使用。示例以下示例展示了从test表...
例如：include refid="SELECT_ALL_FROM"/WHERE id={pk}update id="updateAaaa"UPDATE test_sql_review_table SET db_id={dbId}WHERE detail_id={detailId}AND is_delete='N'/update建议改进...
对于非主键点查场景（如select*from tbl where col 1=xx and col 2=yyy语句），尤其是表的列很多，且查询结果需要展示很多列，行列共存针对该场景，优化器在生成执行计划时，...
检查每个TG配置，一个TG不建议超过3000张表(table_num)SELECT tablegroup_name AS table_group,max(property_value)FILTER(WHERE property_key='shard_count')AS shard_count,max(property_...
使用CTE的方式重写以上语句，命令示例如下：with a as(select*from src where key is not null),b as(select*from src 2 where value 0),c as(select*from src 3 where value 0),d as(select a....
SQL语句如下：SELECT COUNT(1)WHERE ResourceType='ACS:ECS:Instance'AND Memory=1024 AND Tags.Key='product'示例3：搜索2021-01-01 00:00:00之后创建的所有云服务器ECS实例。...
[.]-dml@var 1:=SELECT[ALL|DISTINCT]select_expr,select_expr,.FROM table 3[WHERE where_condition];var 2:=SELECT[ALL|DISTINCT]select_expr,select_expr,.FROM table 4[WHERE where_condition];var 3:...
where条件里有且只能有全部的PK，从Hologres V 1.3版本开始，支持where过滤条件的最后一个字段为非PK字段，该非PK字段支持=、=、=、IS NULL、IS NOT NULL比较符以及使用...
支持的条件表达式OR或者AND LIKE或者NOT LIKE IS NULL或者NOT NULL BETWEEN XX AND XX支持数量符号：=、=、=、IN或者NOT IN支持GROUP BY分组SELECT c 1,Sum(c 2)FROM dt WHERE p 2 IN...
SELECT cat_id,category_name FROM category where cat_id=2;SELECT cat_id,category_name FROM category where cat_id in(2,3);3.2 KKV表Note：示例中KKV表company的PK字段为company_id。...
[with cte[,.]]select[all|distinct]select_expr[,except_expr)][,replace_expr].from ld_data_unit.logical_table_name[where where_condition][group by{col_list|rollup(col_list)}][having having_...
Time:3577.714 ms(00:03.578)-提取人群ID select uid from t_user_tag where tag=1 union select uid from t_user_tag where tag=3 union select uid from t_user_tag where tag=10 union select uid...
支持版本=Ha 3 3.7.0语法格式select:SELECT[ALL|DISTINCT]{*|projectItem[,projectItem]*}FROM tableExpression[WHERE booleanExpression][GROUP BY{groupItem[,groupItem]*}][HAVING...
SELECT Carrier,c,c 2,c*100/c 2 as c 3 FROM(SELECT Carrier,count(*)AS c FROM ontime WHERE DepDelay 10 AND Year=2007 GROUP BY Carrier)ANY INNER JOIN(SELECT Carrier,count(*)AS c 2 FROM ontime...
WHERE size 100-扫描medium和large分区WHERE size=100-扫描medium和large分区WHERE size=100-扫描medium分区WHERE size=100-扫描small和medium分区WHERE size 100-扫描small分区...
命令格式[with cte[,.]]SELECT[all|distinct]SELECT_expr[,except_expr][,replace_expr].from table_reference[where where_condition][group by{col_list|rollup(col_list)}][having having_condition...
将对应字段数据为NULL的值订正为某个默认值或者删除对应字段值为NULL的记录，SQL语句如下所示：订正为默认值：update[$Table_Name]set[$Field]=[$Value]where[$Field]is NULL;...
示例双路合并：SELECT nid,brand,price,size FROM phone WHERE nid 5 UNION ALL SELECT nid,brand,price,size FROM phone WHERE nid 5多路合并：SELECT nid,brand,price,size FROM phone WHERE nid=...
例如：*|SELECT*FROM log WHERE from_unixtime(_time_)from_unixtime(1664186624)AND from_unixtime(_time_)now()*|SELECT*FROM log WHERE_time_to_unixtime(date_parse('2022-10-19 15:46:05','%Y-%m-%...
创建物化视图语句如下：create materialized view mv as select empid，deptname,hire_date from emps join depts on emps.deptno=depts.deptno where hire_date='2016-01-01';基于创建的物化...
select*from t 1 where(select count(*)from t 2 where(select count(*)from t 3 where t 3.a=t 1.a)=2)=3;scalar subquery只能在where子句中使用。不能在子查询的select中引用。select*from...
输入左表的where条件通过where条件实现数据过滤，与SQL类似，例如age 40。说明仅支持以下操作符：=!like rlike右表输出列进行联合操作时，左右表选择的列数需相同，对应...
例如：单表select*from test where id=10 for update select*from test where id=10 for update id说明锁定id=10的行。多表select*from test inner join t 1 on test.id=t 1.id where test.id=10...
2.将where后可以过滤掉大量数据的条件提前。3.避免在where后使用表达式操作。dataphin底层使用的是MaxCompute，可以通过Logview来进行判断任务执行慢的原因，使用方式...
Hologres原生引擎（HQE）不支持的函数建议改写的函数样例备注not in not exists select*from tmp where not exists(select a from tmp 1 where a=tmp.a);不涉及。regexp_split_to_table...
SELECT"A"+5 FROM"add"SELECT*FROM"add"WHERE"A"+5 10两个field相加。SELECT"A"+"B"FROM"add"SELECT*FROM"add"WHERE"A"+"B"=10减法与常数相减。SELECT 1-"A"FROM"sub"SELECT*FROM"sub"WHERE 1-"A...
示例双路合并：SELECT nid,brand,price,size FROM phone WHERE nid 5 UNION ALL SELECT nid,brand,price,size FROM phone WHERE nid 5多路合并：SELECT nid,brand,price,size FROM phone WHERE nid=...
执行相同的操作，在WHERE子句中使用子选择：UPDATE employees SET sales_count=sales_count+1 WHERE id=(SELECT sales_person FROM accounts WHERE name='Acme Corporation');更新accounts表...
如源库中同一张表内存在两个列A和a，由于过滤条件忽略列名的英文大小写，则SQL WHERE语句仅支持过滤列A，不支持过滤列a，例如支持WHERE A=10，不支持WHERE a=10。...
(Optional,ForceNew,Computed)A list of Host Account IDs.instance_id-(Required,ForceNew)Specifies the database where you want to create your hosting account's host bastion host ID of.name_...
示例双路合并：SELECT nid,brand,price,size FROM phone WHERE nid 5 UNION ALL SELECT nid,brand,price,size FROM phone WHERE nid 5多路合并：SELECT nid,brand,price,size FROM phone WHERE nid=...
update acid_update_t set(id,value 1,value 2)=(select id,max(value 1),max(value 2)from acid_update_s where acid_update_t.id=acid_update_s.id group by acid_update_s.id)where acid_update_t.id...
更多WHERE子句信息，请参见WHERE子句（where_condition）。如果不带WHERE子句，会删除表中的所有数据。使用示例示例1：创建非分区表acid_delete，并导入数据，执行delete操作...
支持版本=Ha 3 3.7.0语法格式SELECT:SELECT[DISTINCT]{*|projectItem[,projectItem]*}FROM tableExpression[WHERE booleanExpression][GROUP BY{groupItem[,groupItem]*}][ORDER BY{orderByItem...
Level|Code|Message|+-+-+-+|Warning|1064|Optimizer hint syntax error near'-1)*/t set col 1=col 1+1 where id=1'at line 1|Note|1003|update/*+COMMIT_ON_SUCCESS ROLLBACK_ON_FAIL*/`test`.`t...
子查询是指在父查询的WHERE子句或HAVING子句中嵌套另一个SELECT语句的查询，本文主要介绍PolarDB-X如何优化和执行子查询。基本概念根据是否存在关联项，子查询可以...
语法SELECT[ALL|DISTINCT]select_expr[,select_expr.][FROM table_references[WHERE where_condition][GROUP BY{col_name|expr|position}[HAVING where_condition][ORDER BY{col_name|expr|position...
不需要区分NULL和FALSE的子查询:SELECT 1 FROM.WHERE(oe$cmp$ie)AND subq_where需要区分的子查询:SELECT 1 FROM.WHERE subq_where AND trigcond((oe$cmp$ie)OR(ie IS NULL))HAVING trigcond...
支持版本=Ha 3 3.7.0语法格式SELECT:SELECT[DISTINCT]{*|projectItem[,projectItem]*}FROM tableExpression[WHERE booleanExpression][GROUP BY{groupItem[,groupItem]*}][ORDER BY{orderByItem...
以下章节将详细介绍如何在SELECT语句的WHERE子句中指定其它的时间范围。绝对时间使用日期-时间字符串（date-time string）和epoch时间来指定绝对时间。语法SELECT_clause...