Question

我有一个复杂的select语句，当它被执行时，我给它一个我想要的日期或日期范围，输出结果。问题是我不知道如何加入相同的SQL语句，第一个Statement有1个日期范围，第二个语句有另一个数据范围。示例如下：

当我执行select语句时，我选择11月：
EMPLID NAME Current_Gross_Hours（十一月）

当我再次执行select语句时，我选择从1月到11月：
EMPLID NAME Year_To_Date_Hours（1月至11月）

我想要的是什么：
EMPLID NAME Current_Gross_Hours（十一月）Year_To_Date_Hours（一月至十一月）

如果自己执行，则SQL Select语句可以正确运行。但我不知道如何加入他们。这是我想要编写的SQL代码，但我不知道如何正确编写SQL语句。非常感谢任何帮助或指导。

(SELECT DISTINCT
SUM("PSA"."AL_HOURS") AS "Current Gross Hours", "PSJ"."EMPLID","PSP"."NAME"
FROM
"PS_JOB" "PSJ", "PS_EMPLOYMENT" "PSE", "PS_PERSONAL_DATA" "PSP", "PS_AL_CHK_HRS_ERN" "PSA"
WHERE
((("PSA"."CHECK_DT" = TO_DATE('2011-11-01', 'YYYY-MM-DD')) AND
("PSJ"."PAYGROUP" = 'SK2') AND
(("PSJ"."EFFSEQ"= ( 
    SELECT MAX("INNERALIAS"."EFFSEQ")
    FROM "PS_JOB" INNERALIAS 
    WHERE "INNERALIAS"."EMPL_RCD_NBR" = "PSJ"."EMPL_RCD_NBR"
    AND "INNERALIAS"."EMPLID" = "PSJ"."EMPLID"
    AND "INNERALIAS"."EFFDT" = "PSJ"."EFFDT")
AND
"PSJ"."EFFDT" = ( 
    SELECT MAX("INNERALIAS"."EFFDT")
    FROM "PS_JOB" INNERALIAS 
    WHERE "INNERALIAS"."EMPL_RCD_NBR" = "PSJ"."EMPL_RCD_NBR"
    AND "INNERALIAS"."EMPLID" = "PSJ"."EMPLID"
    AND "INNERALIAS"."EFFDT" <= SYSDATE))))) 
AND
("PSJ"."EMPLID" = "PSE"."EMPLID" ) AND ("PSJ"."EMPLID" = "PSP"."EMPLID" ) AND ("PSJ"."FILE_NBR" = "PSA"."FILE_NBR" ) AND ("PSJ"."PAYGROUP" = "PSA"."PAYGROUP" ) AND ("PSE"."EMPLID" = "PSP"."EMPLID" )
GROUP BY
"PSJ"."EMPLID", "PSP"."NAME"
) AS "Q1"

LEFT JOIN


(SELECT DISTINCT
SUM("PSA"."AL_HOURS") AS "YEAR_TO_DATE Gross Hours", "PSJ"."EMPLID"
FROM
"PS_JOB" "PSJ", "PS_EMPLOYMENT" "PSE", "PS_PERSONAL_DATA" "PSP", "PS_AL_CHK_HRS_ERN" "PSA"
WHERE
((("PSA"."CHECK_DT" BETWEEN TO_DATE('2011-01-01', 'YYYY-MM-DD') AND TO_DATE('2011-11-01', 'YYYY-MM-DD'))  AND
("PSJ"."PAYGROUP" = 'SK2') AND
(("PSJ"."EFFSEQ"= ( 
    SELECT MAX("INNERALIAS"."EFFSEQ")
    FROM "PS_JOB" INNERALIAS 
    WHERE "INNERALIAS"."EMPL_RCD_NBR" = "PSJ"."EMPL_RCD_NBR"
    AND "INNERALIAS"."EMPLID" = "PSJ"."EMPLID"
    AND "INNERALIAS"."EFFDT" = "PSJ"."EFFDT")
AND
"PSJ"."EFFDT" = ( 
    SELECT MAX("INNERALIAS"."EFFDT")
    FROM "PS_JOB" INNERALIAS 
    WHERE "INNERALIAS"."EMPL_RCD_NBR" = "PSJ"."EMPL_RCD_NBR"
    AND "INNERALIAS"."EMPLID" = "PSJ"."EMPLID"
    AND "INNERALIAS"."EFFDT" <= SYSDATE))))) 
AND
("PSJ"."EMPLID" = "PSE"."EMPLID" ) AND ("PSJ"."EMPLID" = "PSP"."EMPLID" ) AND ("PSJ"."FILE_NBR" = "PSA"."FILE_NBR" ) AND ("PSJ"."PAYGROUP" = "PSA"."PAYGROUP" ) AND ("PSE"."EMPLID" = "PSP"."EMPLID" )
GROUP BY
"PSJ"."EMPLID"
) AS "Q2"
 ON "Q1"."EMPLID"="Q2"."EMPLID"
ORDER BY
"Q1"."NAME"

Answer 1

您在开始时缺少SELECT ... FROM。 AS关键字仅在创建列别名而非查询块别名时有效。引号仅对区分大小写的列名称是必需的 - 它们在您的示例中看起来不正确，但它们经常会导致错误。

SELECT Q1.NAME, ...
FROM
(
     SELECT ...
) Q1
JOIN
(
     SELECT ...
) Q2
ON Q1.EMPLID=Q2.EMPLID
ORDER BY Q1.NAME

使用具有多个别名的外部联接来连接两个SELECT语句

1 个答案: