标签：factor fct expr pre express 包括 div tab actor
/*
WEEK(<date>)
返回周数
WEEKDAY(<date>)
返回日期所在周天，星期1（0）~星期天(6)
*/
SELECT WEEK(TO_DATE(‘2011-05-30‘, ‘YYYY-MM-DD‘)) FROM DUMMY; SELECT WEEK (‘2017-01-02‘) FROM DUMMY; SELECT WEEKDAY (TO_DATE (‘2010-12-31‘, ‘YYYY-MM-DD‘)) "week day" FROM DUMMY;
/*
WEIGHTED_AVG(<expression>) <window_specification>
计算规则：
weight(<i>) = 2 * (<n> + 1 - <i>) / (<n> * (<n> + 1))
*/
CREATE ROW TABLE TEST_WEIGHT (station INT, ts DATE, temperature FLOAT); INSERT INTO TEST_WEIGHT VALUES(1, ‘2014-01-01‘, 0.0); INSERT INTO TEST_WEIGHT VALUES(1, ‘2014-01-02‘, 3.0); INSERT INTO TEST_WEIGHT VALUES(1, ‘2014-01-03‘, 4.5); INSERT INTO TEST_WEIGHT VALUES(2, ‘2014-01-04‘, 6.0); INSERT INTO TEST_WEIGHT VALUES(2, ‘2014-01-05‘, 6.3); SELECT ts, temperature, WEIGHTED_AVG(temperature) OVER (ORDER BY ts ROWS BETWEEN 1 PRECEDING AND CURRENT ROW) FROM TEST_WEIGHT ORDER BY ts;
/*
WIDTH_BUCKET(<expression>, <min_value>, <max_value>, <num_buckets>)
<expression>数字类型或者时间类型，或者能够转换成的类型
<min_value>
<max_value>
<num_buckets>
*/
CREATE TABLE TEST_WIDTH_BUCKET (NUM INT); INSERT INTO TEST_WIDTH_BUCKET VALUES(1); INSERT INTO TEST_WIDTH_BUCKET VALUES(2); INSERT INTO TEST_WIDTH_BUCKET VALUES(3); INSERT INTO TEST_WIDTH_BUCKET VALUES(4); INSERT INTO TEST_WIDTH_BUCKET VALUES(5); --不存在？ --SELECT *, WIDTH_BUCKET( NUM, 2, 5, 2 ) FROM TEST_WIDTH_BUCKET;
/*
WORKDAYS_BETWEEN(<factory_calendar_id>, <start_date>, <end_date> [, <source_schema>])
计算开始日期和结束日期之间的工作日数
<factory_calendar_id> ::= <string_literal>
工厂日历ID,工厂日历表：TFACS
<start_date> ::= <string_literal> | <DATE>
<end_date> ::= <string_literal> | <DATE>
<source_schema> ::= <string_literal>
TFACS所在schema
如果<start_date>小于<end_date>,返回之间工作日，包括<start_date>，不包括<end_date>
如果<start_date>大于<end_date>,返回负数工作日，包括<end_date>,不包括<start_date>
*/
--SELECT WORKDAYS_BETWEEN(‘01‘, ‘2014-01-09‘, ‘2014-01-10‘ , ‘FCTEST‘) FROM DUMMY;
标签：factor fct expr pre express 包括 div tab actor
原文地址：https://www.cnblogs.com/tangToms/p/13939794.html
