startTime := curMM||'01 00:00:00'; endTime := to_char( startTime::timestamp + interval '1 month', 'YYYY-MM-DD HH24:MI:SS'); strSQL := 'CREATE TABLE IF NOT EXISTS '||TG_RELNAME||'_'||curMM|| ' ( CHECK('||time_column_name||'>='''|| startTime ||''' AND ' ||...
使用窗口函数:可以使用窗口函数ROW_NUMBER()对日期进行排序,并使用PARTITION BY子句将数据分组为每个月,然后选择每个分组中的最后一行。 代码语言:txt 复制 SELECT month, your_value_column AS last_value FROM ( SELECT date_trunc('month', your_date_column) AS month, your_value_column, ROW_NUMBER() OVE...
代码语言:txt 复制 SELECT department, SUM(sales) OVER (PARTITION BY department) AS total_sales FROM sales_table; 计算每个月的销售额及累计销售额: 代码语言:txt 复制 SELECT month, sales, SUM(sales) OVER (ORDER BY month) AS cumulative_sales FROM sales_table; 计算每个部门的销售额排名: ...
SUBPARTITION BY HASH(p_month) SUBPARTITIONS 2 ( partition t1_p1 values less than (to_date('2022-01-01','yyyy-MM-dd'))( SUBPARTITION t1_p1_h1, SUBPARTITION t1_p1_h2 ), partition t1_p2 values less than (to_date('2022-01-15','yyyy-MM-dd'))( SUBPARTITION t1_p2_h1, SUBPARTITION ...
endTime := to_char( startTime::timestamp + interval '1 month', 'YYYY-MM-DD HH24:MI:SS'); strSQL := 'CREATE TABLE IF NOT EXISTS '||TG_RELNAME||'_'||curMM|| ' ( CHECK('||time_column_name||'>='''|| startTime ||''' AND ' ...
CREATE TABLE students (id INTEGER, status character varying(30), name character varying(30)) PARTITION BY LIST(status); CREATE TABLE stu_active PARTITION OF students FOR VALUES IN ('ACTIVE'); CREATE TABLE stu_exp PARTITION OF students FOR VALUES IN ('EXPIRED'); ...
tablepartitionsadd_month,按月生成分区表,一月一个分区表 CREATEORREPLACEFUNCTIONpublic.tablepartitionsadd_month( p_tablenametext, p_schematext, p_date_starttext, p_stepinteger)RETURNSvoid LANGUAGE'plpgsql'COST100VOLATILE PARALLEL UNSAFEAS$BODY$declarev_cntint; ...
一级分区在month字段上做RANGE分区,二级分区在region上做了LIST分区。 CREATE TABLE sales(id int, year int, month int, day int, region text) DISTRIBUTED BY (id) PARTITION BY RANGE (month) SUBPARTITION BY LIST (region) SUBPARTITION TEMPLATE ( SUBPARTITION usa VALUES ('usa'), SUBPARTITION europe ...
year|month|day|hour|minute|second---+---+---+---+---+---2023|10|1|12|34|56 AI代码助手复制代码 2.5DATE_TRUNC()函数 DATE_TRUNC()函数用于将日期或时间截断到指定的精度。例如: SELECTDATE_TRUNC('hour',NOW())AStruncated_hour,DATE_TRUNC('day',NOW())AStruncated_day,DATE_TRUNC('month...
1.定义分区表-主表createtablesys_log(idvarchar(32),msgvarchar(1024),provincevarchar(6),log_monthint,primarykey(id,log_month)-- 主键必须要包含分区的字段)PARTITIONBYLIST(log_month);--- 按照log_month进行分区表的设计###--- 2.定义分区表子表CREATETABLEsys_log_202401PARTITIONOFsys_logFORVALUESIN...