Editing HR.JOB HISTORY (table)

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{| border="1" cellpadding="5" cellspacing="0" style="border-collapse:collapse"
 
{| border="1" cellpadding="5" cellspacing="0" style="border-collapse:collapse"
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|- valign="top"
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|-
 
| '''Table
 
| '''Table
 
| HR.JOB_HISTORY
 
| HR.JOB_HISTORY
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|- valign="top"
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|-
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| '''Description
 
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| Table that stores job history of the employees. If an employee
 
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changes departments within the job or changes jobs within the department,
 
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new rows get inserted into this table with old job information of the
 
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employee. Contains a complex primary key: employee_id+start_date.
 
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Contains 25 rows. References with jobs, employees, and departments tables.
 
 
|}
 
|}
  
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=== Columns ===
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{| border="1" cellpadding="5" cellspacing="0" style="border-collapse:collapse"
 
{| border="1" cellpadding="5" cellspacing="0" style="border-collapse:collapse"
 
|- style="background:silver"
 
|- style="background:silver"
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| '''Nullable
 
| '''Nullable
 
| '''Default
 
| '''Default
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| '''Description
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| '''PK
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| '''Index
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|- valign="top"
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 +
|-
 
| EMPLOYEE_ID
 
| EMPLOYEE_ID
 
| NUMBER(6, 0)
 
| NUMBER(6, 0)
 
| not null
 
| not null
 
|  
 
|  
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| A not null column in the complex primary key employee_id+start_date.
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| JHIST_EMP_ID_ST_DATE_PK
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Foreign key to employee_id column of the employee table
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| JHIST_EMPLOYEE_IX
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|- valign="top"
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|-
 
| START_DATE
 
| START_DATE
 
| DATE(7)
 
| DATE(7)
 
| not null
 
| not null
 
|  
 
|  
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| A not null column in the complex primary key employee_id+start_date.
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| JHIST_EMP_ID_ST_DATE_PK
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Must be less than the end_date of the job_history table. (enforced by
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|
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constraint jhist_date_interval)
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|-
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|- valign="top"
 
 
| END_DATE
 
| END_DATE
 
| DATE(7)
 
| DATE(7)
 
| not null
 
| not null
 
|  
 
|  
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| Last day of the employee in this job role. A not null column. Must be
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|  
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greater than the start_date of the job_history table.
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|
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(enforced by constraint jhist_date_interval)
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|-
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|- valign="top"
 
 
| JOB_ID
 
| JOB_ID
 
| VARCHAR2(10)
 
| VARCHAR2(10)
 
| not null
 
| not null
 
|  
 
|  
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| Job role in which the employee worked in the past; foreign key to
+
|  
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job_id column in the jobs table. A not null column.
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| JHIST_JOB_IX
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|- valign="top"
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|-
 
| DEPARTMENT_ID
 
| DEPARTMENT_ID
 
| NUMBER(4, 0)
 
| NUMBER(4, 0)
 
| null
 
| null
 
|  
 
|  
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| Department id in which the employee worked in the past; foreign key to deparment_id column in the departments table
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|  
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|}
 
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=== Primary Key ===
 
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{| border="1" cellpadding="5" cellspacing="0" style="border-collapse:collapse"
 
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|- style="background:silver"
 
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| '''Primary Key
 
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| '''Columns
 
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|- valign="top"
 
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| JHIST_EMP_ID_ST_DATE_PK
 
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| EMPLOYEE_ID, START_DATE
 
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|}
 
−
 
 
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=== Indexes ===
 
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{| border="1" cellpadding="5" cellspacing="0" style="border-collapse:collapse"
 
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|- style="background:silver"
 
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| '''Index
 
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| '''Type
 
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| '''Columns
 
−
 
 
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|- valign="top"
 
 
| JHIST_DEPARTMENT_IX
 
| JHIST_DEPARTMENT_IX
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|
 
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| DEPARTMENT_ID
 
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|- valign="top"
 
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| JHIST_EMPLOYEE_IX
 
−
|
 
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| EMPLOYEE_ID
 
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|- valign="top"
 
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| JHIST_JOB_IX
 
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|
 
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| JOB_ID
 
 
|}
 
|}
  
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=== Check Constraints ===
 
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{| border="1" cellpadding="5" cellspacing="0" style="border-collapse:collapse"
 
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|- style="background:silver"
 
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| '''Check Constraint
 
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| '''Expression
 
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| '''Description
 
  
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|- valign="top"
 
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| JHIST_DATE_INTERVAL
 
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| end_date > start_date
 
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|
 
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|- valign="top"
 
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| JHIST_EMPLOYEE_NN
 
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| "EMPLOYEE_ID" IS NOT NULL
 
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|
 
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|- valign="top"
 
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| JHIST_END_DATE_NN
 
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| "END_DATE" IS NOT NULL
 
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|
 
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|- valign="top"
 
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| JHIST_JOB_NN
 
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| "JOB_ID" IS NOT NULL
 
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|
 
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|- valign="top"
 
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| JHIST_START_DATE_NN
 
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| "START_DATE" IS NOT NULL
 
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|
 
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|}
 
  
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=== Foreign Keys ===
 
 
{| border="1" cellpadding="5" cellspacing="0" style="border-collapse:collapse"
 
{| border="1" cellpadding="5" cellspacing="0" style="border-collapse:collapse"
 
|- style="background:silver"
 
|- style="background:silver"
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| '''Column
 
| '''Column
 
| '''Referenced Column
 
| '''Referenced Column
−
 
+
−
|- valign="top"
+
|-
 
| [[HR.DEPARTMENTS_(table)|HR.DEPARTMENTS]]
 
| [[HR.DEPARTMENTS_(table)|HR.DEPARTMENTS]]
 
| DEPARTMENT_ID
 
| DEPARTMENT_ID
 
| DEPARTMENT_ID
 
| DEPARTMENT_ID
−
|- valign="top"
+
|-
 
| [[HR.EMPLOYEES_(table)|HR.EMPLOYEES]]
 
| [[HR.EMPLOYEES_(table)|HR.EMPLOYEES]]
 
| EMPLOYEE_ID
 
| EMPLOYEE_ID
 
| EMPLOYEE_ID
 
| EMPLOYEE_ID
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|- valign="top"
+
|-
 
| [[HR.JOBS_(table)|HR.JOBS]]
 
| [[HR.JOBS_(table)|HR.JOBS]]
 
| JOB_ID
 
| JOB_ID
 
| JOB_ID
 
| JOB_ID
 
|}
 
|}

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