Oracle学习笔记

相关问题

组合count()，sum()等聚合函数与普通字段的查询结果

SELECT t3.COMPANYCODE AS COMPANYCODE,t3.SECUCODE AS SECUCODE,t3.TOTALSCORE_Z AS TOTALSCORE_Z,t1.lessCount AS LESSCOUNT,
	t2.totalCount AS TOTALCOUNT, CAST((LESSCOUNT / TOTALCOUNT * 100) AS DECIMAL) AS SCOREORDER, t3.TRADINGDAY
FROM (
	SELECT COUNT(COMPANYCODE) AS lessCount
	FROM ANALYZE.IMATRIX_CUBE_SUBSCORE 
	WHERE TradingDay = (SELECT tradingday FROM IMATRIX.TRADINGDAY_VIEW ORDER BY TRADINGDAY DESC FETCH FIRST 1 ROWS ONLY)
	AND TOTALSCORE_Z < (
		SELECT TOTALSCORE_Z 
		FROM ANALYZE.IMATRIX_CUBE_SUBSCORE 
		WHERE TradingDay = (SELECT tradingday FROM IMATRIX.TRADINGDAY_VIEW ORDER BY TRADINGDAY DESC FETCH FIRST 1 ROWS ONLY)
		AND COMPANYCODE = 74627
	)
) t1,(
	SELECT COUNT(COMPANYCODE) AS totalCount
	FROM ANALYZE.IMATRIX_CUBE_SUBSCORE 
	WHERE TradingDay = (SELECT tradingday FROM IMATRIX.TRADINGDAY_VIEW ORDER BY TRADINGDAY DESC FETCH FIRST 1 ROWS ONLY)
) t2,(
	SELECT TRADINGDAY,COMPANYCODE,SECUCODE,TOTALSCORE_Z
	FROM ANALYZE.IMATRIX_CUBE_SUBSCORE
	WHERE TradingDay = (SELECT tradingday FROM IMATRIX.TRADINGDAY_VIEW ORDER BY TRADINGDAY DESC FETCH FIRST 1 ROWS ONLY)
	AND COMPANYCODE = 74627
) t3

查询结果

窗口函数 ROW_NUMBER()、OVER()、FIRST_VALUE()的用法

ROW_NUMBER()——生成行号
OVER()——窗口函数，类似于分组的功能
FIRST_VALUE()——取分组中的第一条记录，常用语窗口函数中

SELECT * 
FROM (
    SELECT secucode,secuabbr,tradingday,PREVCLOSEPRICE,CLOSEPRICE,
    		-- ROW_NUMBER()——生成行号
    		-- OVER()——窗口函数，根据股票代码分组并由交易日降序排序
    	ROW_NUMBER() OVER(PARTITION BY SECUCODE ORDER BY TRADINGDAY DESC) RN,
    		-- FIRST_VALUE()——取第一条记录的指定值
    	FIRST_VALUE(CLOSEPRICE) OVER(PARTITION BY SECUCODE ORDER BY TRADINGDAY) P_START
    	FROM imatrix.imatrix_cube_basic
    	WHERE (tradingday > to_date('2018-01-01', 'yyyy-mm-dd') and tradingday < to_date('2018-02-01', 'yyyy-mm-dd')) 
        AND secucode in ('300058', '002901')
) WHERE RN = 1

结果

聚合函数listtagg()的用法

listagg()——分组拼接对应属性名

SELECT
    name,
    chiname,
    listagg('"' || name,'",') within GROUP (order by name) over()
FROM
    imatrix.imatrix_factors
WHERE
        chiname IS NOT NULL
    AND
        table_name = 'IMATRIX_CUBE_MAIN_INDEX'

结果

注意事项

• 强烈建议使用dbeaver的sql保存功能
• 涉及表名的操作都必须加Schema名作为前缀名

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