Oracle 创建嵌套表并仅在内部表中插入数据_Oracle_Plsql

Oracle 创建嵌套表并仅在内部表中插入数据

oracle plsql

Oracle 创建嵌套表并仅在内部表中插入数据,oracle,plsql,Oracle,Plsql,我有一个表：employees（id、firstname、lastname、salary），我添加了另一个列来存储每个员工过去的所有工资 CREATE OR REPLACE TYPE salary_list AS TABLE OF NUMBER; / ALTER TABLE employees ADD (salary_history salary_list) NESTED TABLE salary_history STORE AS salary_history_tab; 现在，该表是emplo

我有一个表：employees（id、firstname、lastname、salary），我添加了另一个列来存储每个员工过去的所有工资

CREATE OR REPLACE TYPE salary_list AS TABLE OF NUMBER;
/
ALTER TABLE employees
ADD (salary_history salary_list)
NESTED TABLE salary_history STORE AS salary_history_tab;

现在，该表是employees（id、firstname、lastname、salary、salary\u history），salary\u history为空。修改salaray值时，如何将当前薪资值插入内部表格salary\u history？我尝试过：

INSERT INTO 
TABLE(SELECT salary_history FROM employees WHERE id=1) 
VALUES(1500);

我得到以下错误：

ORA-22908:对空表值的引用

是的，嵌套表salary\u history为空，因为我刚刚创建了它。我做错了什么？通过id将值（附加到现有数据）插入工资\ U历史记录以识别员工的正确方法是什么

更新：添加了nvl（，（）），如下所示：

我现在得到的错误是：

ORA-25015:无法在此嵌套表视图列上执行DML

该列当前为空，而不是空表；您可以创建一个空的嵌套表来开始：

UPDATE employees
SET salary_history = NEW salary_list()
WHERE id = 1;

1 row updated.

那么你的第一句话就行了：

INSERT INTO 
TABLE(SELECT salary_history FROM employees WHERE id=1) 
VALUES(1500);

1 row inserted.

您可以看到新值：

SELECT * FROM employees;

        ID FIRSTNAME  LASTNAME       SALARY SALARY_HISTORY                
---------- ---------- ---------- ---------- ------------------------------
         1 Joe        BLoggs           1234 SALARY_LIST(1500)

该列当前为空，而不是空表；您可以创建一个空的嵌套表来开始：

UPDATE employees
SET salary_history = NEW salary_list()
WHERE id = 1;

1 row updated.

那么你的第一句话就行了：

INSERT INTO 
TABLE(SELECT salary_history FROM employees WHERE id=1) 
VALUES(1500);

1 row inserted.

您可以看到新值：

SELECT * FROM employees;

        ID FIRSTNAME  LASTNAME       SALARY SALARY_HISTORY                
---------- ---------- ---------- ---------- ------------------------------
         1 Joe        BLoggs           1234 SALARY_LIST(1500)

您可以使用

合并（salary_history，salary_list（））多集联合所有salary_list（：您的新值）

将新值附加到旧列表中（如果不存在，则创建新列表）

Oracle 11g R2架构设置：

CREATE OR REPLACE TYPE salary_list AS TABLE OF NUMBER;
/

CREATE TABLE employees(
  id             NUMBER,
  salary_history salary_list
) NESTED TABLE salary_history STORE AS salary_history_tab
/

INSERT INTO employees VALUES ( 1, NULL )
/

UPDATE employees
SET   salary_history = COALESCE( salary_history, salary_list() )
                       MULTISET UNION ALL salary_list( 500 )
WHERE id = 1

SELECT * FROM employees

| ID | SALARY_HISTORY |
|----|----------------|
|  1 |            500 |

UPDATE employees
SET   salary_history = COALESCE( salary_history, salary_list() )
                       MULTISET UNION ALL salary_list( 700 )
WHERE id = 1

SELECT * FROM employees

| ID | SALARY_HISTORY |
|----|----------------|
|  1 |        500,700 |

UPDATE employees
SET   salary_history = COALESCE( salary_history, salary_list() )
                       MULTISET UNION ALL salary_list( 500 )
WHERE id = 1

SELECT * FROM employees

| ID | SALARY_HISTORY |
|----|----------------|
|  1 |    500,700,500 |

查询1：

CREATE OR REPLACE TYPE salary_list AS TABLE OF NUMBER;
/

CREATE TABLE employees(
  id             NUMBER,
  salary_history salary_list
) NESTED TABLE salary_history STORE AS salary_history_tab
/

INSERT INTO employees VALUES ( 1, NULL )
/

UPDATE employees
SET   salary_history = COALESCE( salary_history, salary_list() )
                       MULTISET UNION ALL salary_list( 500 )
WHERE id = 1

SELECT * FROM employees

| ID | SALARY_HISTORY |
|----|----------------|
|  1 |            500 |

UPDATE employees
SET   salary_history = COALESCE( salary_history, salary_list() )
                       MULTISET UNION ALL salary_list( 700 )
WHERE id = 1

SELECT * FROM employees

| ID | SALARY_HISTORY |
|----|----------------|
|  1 |        500,700 |

UPDATE employees
SET   salary_history = COALESCE( salary_history, salary_list() )
                       MULTISET UNION ALL salary_list( 500 )
WHERE id = 1

SELECT * FROM employees

| ID | SALARY_HISTORY |
|----|----------------|
|  1 |    500,700,500 |

：

CREATE OR REPLACE TYPE salary_list AS TABLE OF NUMBER;
/

CREATE TABLE employees(
  id             NUMBER,
  salary_history salary_list
) NESTED TABLE salary_history STORE AS salary_history_tab
/

INSERT INTO employees VALUES ( 1, NULL )
/

UPDATE employees
SET   salary_history = COALESCE( salary_history, salary_list() )
                       MULTISET UNION ALL salary_list( 500 )
WHERE id = 1

SELECT * FROM employees

| ID | SALARY_HISTORY |
|----|----------------|
|  1 |            500 |

UPDATE employees
SET   salary_history = COALESCE( salary_history, salary_list() )
                       MULTISET UNION ALL salary_list( 700 )
WHERE id = 1

SELECT * FROM employees

| ID | SALARY_HISTORY |
|----|----------------|
|  1 |        500,700 |

UPDATE employees
SET   salary_history = COALESCE( salary_history, salary_list() )
                       MULTISET UNION ALL salary_list( 500 )
WHERE id = 1

SELECT * FROM employees

| ID | SALARY_HISTORY |
|----|----------------|
|  1 |    500,700,500 |

查询2：

CREATE OR REPLACE TYPE salary_list AS TABLE OF NUMBER;
/

CREATE TABLE employees(
  id             NUMBER,
  salary_history salary_list
) NESTED TABLE salary_history STORE AS salary_history_tab
/

INSERT INTO employees VALUES ( 1, NULL )
/

UPDATE employees
SET   salary_history = COALESCE( salary_history, salary_list() )
                       MULTISET UNION ALL salary_list( 500 )
WHERE id = 1

SELECT * FROM employees

| ID | SALARY_HISTORY |
|----|----------------|
|  1 |            500 |

UPDATE employees
SET   salary_history = COALESCE( salary_history, salary_list() )
                       MULTISET UNION ALL salary_list( 700 )
WHERE id = 1

SELECT * FROM employees

| ID | SALARY_HISTORY |
|----|----------------|
|  1 |        500,700 |

UPDATE employees
SET   salary_history = COALESCE( salary_history, salary_list() )
                       MULTISET UNION ALL salary_list( 500 )
WHERE id = 1

SELECT * FROM employees

| ID | SALARY_HISTORY |
|----|----------------|
|  1 |    500,700,500 |

：

CREATE OR REPLACE TYPE salary_list AS TABLE OF NUMBER;
/

CREATE TABLE employees(
  id             NUMBER,
  salary_history salary_list
) NESTED TABLE salary_history STORE AS salary_history_tab
/

INSERT INTO employees VALUES ( 1, NULL )
/

UPDATE employees
SET   salary_history = COALESCE( salary_history, salary_list() )
                       MULTISET UNION ALL salary_list( 500 )
WHERE id = 1

SELECT * FROM employees

| ID | SALARY_HISTORY |
|----|----------------|
|  1 |            500 |

UPDATE employees
SET   salary_history = COALESCE( salary_history, salary_list() )
                       MULTISET UNION ALL salary_list( 700 )
WHERE id = 1

SELECT * FROM employees

| ID | SALARY_HISTORY |
|----|----------------|
|  1 |        500,700 |

UPDATE employees
SET   salary_history = COALESCE( salary_history, salary_list() )
                       MULTISET UNION ALL salary_list( 500 )
WHERE id = 1

SELECT * FROM employees

| ID | SALARY_HISTORY |
|----|----------------|
|  1 |    500,700,500 |

查询3：

CREATE OR REPLACE TYPE salary_list AS TABLE OF NUMBER;
/

CREATE TABLE employees(
  id             NUMBER,
  salary_history salary_list
) NESTED TABLE salary_history STORE AS salary_history_tab
/

INSERT INTO employees VALUES ( 1, NULL )
/

UPDATE employees
SET   salary_history = COALESCE( salary_history, salary_list() )
                       MULTISET UNION ALL salary_list( 500 )
WHERE id = 1

SELECT * FROM employees

| ID | SALARY_HISTORY |
|----|----------------|
|  1 |            500 |

UPDATE employees
SET   salary_history = COALESCE( salary_history, salary_list() )
                       MULTISET UNION ALL salary_list( 700 )
WHERE id = 1

SELECT * FROM employees

| ID | SALARY_HISTORY |
|----|----------------|
|  1 |        500,700 |

UPDATE employees
SET   salary_history = COALESCE( salary_history, salary_list() )
                       MULTISET UNION ALL salary_list( 500 )
WHERE id = 1

SELECT * FROM employees

| ID | SALARY_HISTORY |
|----|----------------|
|  1 |    500,700,500 |

：

CREATE OR REPLACE TYPE salary_list AS TABLE OF NUMBER;
/

CREATE TABLE employees(
  id             NUMBER,
  salary_history salary_list
) NESTED TABLE salary_history STORE AS salary_history_tab
/

INSERT INTO employees VALUES ( 1, NULL )
/

UPDATE employees
SET   salary_history = COALESCE( salary_history, salary_list() )
                       MULTISET UNION ALL salary_list( 500 )
WHERE id = 1

SELECT * FROM employees

| ID | SALARY_HISTORY |
|----|----------------|
|  1 |            500 |

UPDATE employees
SET   salary_history = COALESCE( salary_history, salary_list() )
                       MULTISET UNION ALL salary_list( 700 )
WHERE id = 1

SELECT * FROM employees

| ID | SALARY_HISTORY |
|----|----------------|
|  1 |        500,700 |

UPDATE employees
SET   salary_history = COALESCE( salary_history, salary_list() )
                       MULTISET UNION ALL salary_list( 500 )
WHERE id = 1

SELECT * FROM employees

| ID | SALARY_HISTORY |
|----|----------------|
|  1 |    500,700,500 |