我需要一些帮助，将我的三个代码组合在一个匿名块中，我还需要设置一个用户将使用的替换值。任何想法我怎么能这样做？我使用的是oracle 10g express，这是我的代码：
代码1：显示“美洲”中每个部门的部门名称和每个部门的员工数量。
select department_name, count(employee_id) "number of employees"
from employees, departments, locations, countries, regions
where employees.DEPARTMENT_ID = departments.DEPARTMENT_ID
AND departments.location_ID = locations.location_ID
AND locations.country_ID = countries.country_ID
AND countries.region_ID = regions.region_ID
AND regions.region_name = 'Americas'
group by department_name
代码2：每个职位的平均工资是多少？
SELECT job_ID, AVG(salary) as "avg salary"
FROM employees
GROUP BY job_ID
代码3：每个部门的平均工资是多少？
SELECT department_ID, AVG(salary) as "avg salary"
FROM employees
GROUP BY department_ID
答案 0 :(得分：1)
在Oracle中无法将完全不同的数据集组合到单个块中。匿名块用于执行一系列PL / SQL命令。查询（即返回结果集的任何内容，例如：SELECT ...）只能返回单个结果，因此需要三个单独的查询。
如果您正在使用SQL*Plus，则可以通过命令行和/或.sql脚本文件完成所有这些操作。你也可以在命令行中指定参数（我无法判断你是否对第一个查询意味着什么，但我还是添加了它。）
foo.sql）：-- Set page size to something larger than the expected result set.
-- NOTE: You don't want to put 0 (unlimited) as it supresses the column headers.
SET pagesize 50000
-- Get the parameter from the command line:
VAR region VARCHAR2(256)
EXEC :region := '&1'
SELECT 'Processing for region: ' || :region
FROM dual;
-- Query 1
promp "Employee detail in specified region:"
select department_name, count(employee_id) "number of employees"
from HR.employees, HR.departments, HR.locations, HR.countries, HR.regions
where employees.DEPARTMENT_ID = departments.DEPARTMENT_ID
AND departments.location_ID = locations.location_ID
AND locations.country_ID = countries.country_ID
AND countries.region_ID = regions.region_ID
AND regions.region_name = :region
group by department_name
;
-- Query 2:
promp "Average salary by position:"
SELECT job_ID, AVG(salary) as "avg salary"
FROM HR.employees
GROUP BY job_ID;
-- Query 3:
promp "Average salaries by department:"
SELECT department_ID, AVG(salary) as "avg salary"
FROM HR.employees
GROUP BY department_ID;
exit
$ sqlplus myuser/mypass@lvm01xe @sample.sql Americas
SQL*Plus: Release 11.2.0.2.0 Production on Sun Nov 18 09:11:11 2012
Copyright (c) 1982, 2010, Oracle. All rights reserved.
Connected to:
Oracle Database 10g Express Edition Release 10.2.0.1.0 - Production
PL/SQL procedure successfully completed.
'PROCESSINGFORREGION:'||:REGION
--------------------------------------------------------------------------------
Processing for region: Americas
"Employee detail in specified region:"
DEPARTMENT_NAME number of employees
------------------------------ -------------------
Administration 1
Accounting 2
IT 5
Purchasing 6
Executive 3
Shipping 45
Finance 6
Marketing 2
8 rows selected.
"Average salary by position:"
JOB_ID avg salary
---------- ----------
IT_PROG 5760
AC_MGR 12000
AC_ACCOUNT 8300
ST_MAN 7280
PU_MAN 11000
AD_ASST 4400
AD_VP 17000
SH_CLERK 3215
FI_ACCOUNT 7920
FI_MGR 12000
PU_CLERK 2780
SA_MAN 12200
MK_MAN 13000
PR_REP 10000
AD_PRES 24000
SA_REP 8350
MK_REP 6000
ST_CLERK 2785
HR_REP 6500
19 rows selected.
"Average salaries by department:"
DEPARTMENT_ID avg salary
------------- ----------
100 8600
30 4150
7000
90 19333.3333
20 9500
70 10000
110 10150
50 3475.55556
80 8955.88235
40 6500
60 5760
10 4400
12 rows selected.
Disconnected from Oracle Database 10g Express Edition Release 10.2.0.1.0 - Production
答案 1 :(得分：0)
显然，任何由相同标尺聚合的内容都可以轻松组合。因此，您可以将第三个查询与第一个查询合并，如下所示：
select department_name
, count(employee_id) as "number of employees"
, avg(salary) as "avg salary"
from employees, departments, locations, countries, regions
where employees.DEPARTMENT_ID = departments.DEPARTMENT_ID
AND departments.location_ID = locations.location_ID
AND locations.country_ID = countries.country_ID
AND countries.region_ID = regions.region_ID
AND regions.region_name = :region_name
group by department_name
我已调整您的代码以传入绑定变量:region_name。在Apex中有多种指定变量的方法。 Find out more。
包含第二个查询没有任何有意义的方法。 JOB_ID的值越过DEPARTMENT_ID的值，因此没有要加入的公共密钥。