Недавно введенный в Oracle SQLcl является командой information
или просто INFO table_name
. Он имеет простой синтаксис, такой как DESC[RIBE]
:
SQL> info
INFORMATION
--------
This command is like describe but with more details about the objects requested.
INFO[RMATION] {[schema.]object[@connect_identifier]}
INFO+ will show column statistics
Его вывод намного превосходит и описателен по сравнению с DESCRIBE
. Он перечисляет более подробную информацию о определениях столбцов для таблицы, представления или синонима или спецификациях для функции или процедуры.
Например, например: : Это результат, который я получаю SQLcl: Release 18.1.1, когда я запускаю
info employees
SQL> info employees;
TABLE: EMPLOYEES
LAST ANALYZED:2018-05-26 15:07:58.0
ROWS :107
SAMPLE SIZE :107
INMEMORY :DISABLED
COMMENTS :employees table. Contains 107 rows. References with departments,
jobs, job_history tables. Contains a self reference.
Columns
NAME DATA TYPE NULL DEFAULT COMMENTS
*EMPLOYEE_ID NUMBER(6,0) No Primary key of employees table.
FIRST_NAME VARCHAR2(20 BYTE) Yes First name of the employee. A not null column.
LAST_NAME VARCHAR2(25 BYTE) No Last name of the employee. A not null column.
EMAIL VARCHAR2(25 BYTE) No Email id of the employee
PHONE_NUMBER VARCHAR2(20 BYTE) Yes Phone number of the employee; includes country
code and area code
HIRE_DATE DATE No Date when the employee started on this job. A not
null column.
JOB_ID VARCHAR2(10 BYTE) No Current job of the employee; foreign key to job_id
column of the jobs table. A not null column.
SALARY NUMBER(8,2) Yes Monthly salary of the employee. Must be greater
than zero (enforced by constraint emp_salary_min)
COMMISSION_PCT NUMBER(2,2) Yes Commission percentage of the employee; Only
employees in sales department elgible for
commission percentage
MANAGER_ID NUMBER(6,0) Yes Manager id of the employee; has same domain as
manager_id in departments table. Foreign key to
employee_id column of employees table.(useful for
reflexive joins and CONNECT BY query)
DEPARTMENT_ID NUMBER(4,0) Yes Department id where employee works; foreign key to
department_id column of the departments table
Indexes
INDEX_NAME UNIQUENESS STATUS FUNCIDX_STATUS COLUMNS
HR.EMP_JOB_IX NONUNIQUE VALID JOB_ID
HR.EMP_NAME_IX NONUNIQUE VALID LAST_NAME, FIRST_NAME
HR.EMP_EMAIL_UK UNIQUE VALID EMAIL
HR.EMP_EMP_ID_PK UNIQUE VALID EMPLOYEE_ID
HR.EMP_MANAGER_IX NONUNIQUE VALID MANAGER_ID
HR.EMP_DEPARTMENT_IX NONUNIQUE VALID DEPARTMENT_ID
References
TABLE_NAME CONSTRAINT_NAME DELETE_RULE STATUS DEFERRABLE VALIDATED GENERATED
DEPARTMENTS DEPT_MGR_FK NO ACTION ENABLED NOT DEFERRABLE VALIDATED USER NAME
EMPLOYEES EMP_MANAGER_FK NO ACTION ENABLED NOT DEFERRABLE VALIDATED USER NAME
JOB_HISTORY JHIST_EMP_FK NO ACTION ENABLED NOT DEFERRABLE VALIDATED USER NAME
Вот скриншот с info+
: