如何从Oracle中的表中获取已删除的数据

Question

Can anyone help me retrieve deleted data in Oracle SQL*Plus?

here are the two tables that the data has been deleted from.be informed that only data of current date (T_DT = 28-JUN-15') has been accidentally deleted and the sales center id (SC_CD) selected as 27.

SQL> desc targ_mas
 Name                            Null?    Type
 ------------------------------- -------- ----
 SC_CD                           NOT NULL VARCHAR2(2)
 FP_ID                           NOT NULL VARCHAR2(4)
 T_DT                            NOT NULL DATE
 T_PCT                                    NUMBER(3)
 T_TARG                                   NUMBER(9,2)
 FL_MVH                          NOT NULL VARCHAR2(1)

SQL> 
SQL> 
SQL> desc prod_targ
 Name                            Null?    Type
 ------------------------------- -------- ----
 ASM_ID                                   VARCHAR2(4)
 RM_ID                                    VARCHAR2(4)
 FM_ID                                    VARCHAR2(4)
 FP_ID                           NOT NULL VARCHAR2(4)
 SC_CD                           NOT NULL VARCHAR2(2)
 TYP_CD                          NOT NULL VARCHAR2(2)
 DIV_CD                                   VARCHAR2(1)
 CAT_CD                          NOT NULL VARCHAR2(2)
 PRD_CD                          NOT NULL VARCHAR2(4)
 T_DT                            NOT NULL DATE
 QTY_TARG                                 NUMBER(8,2)
 T_VAL                                    NUMBER(10,2)
 TP_VAL                                   NUMBER(9,2)
 BR_CD                                    VARCHAR2(3)
 BS_CD                                    VARCHAR2(4)
 RMBS_CD                                  VARCHAR2(2)

queries used to delete data from both tables :

delete from targ_mas
where sc_cd = '27'
and t_dt = '28-JUN-15'


delete from prod_targ
where sc_cd = '27'
and t_dt = '28-JUN-15'

Answer 1

Assuming this change has already been committed, your best hope is that you have flashback enabled. If you do, you could, for instance, retrieve it into a table created for this purpose:

CREATE TABLE targ_mas_recov AS (
    SELECT * AS OF TIMESTAMP SYSDATE - 1 # E.g., the data from yesterday
    FROM   targ_mas
    WHERE  sc_cd = '27' AND t_dt = '28-JUN-15'
);

CREATE TABLE prod_targ_recov AS (
    SELECT * AS OF TIMESTAMP SYSDATE - 1 # E.g., the data from yesterday
    FROM prod_targ
    WHERE sc_cd = '27' AND t_dt = '28-JUN-15'
);

Alternatively, if no other update/delete/insert statements that you want to preserve were performed on these table, you could just flashback them directly:

FLASHBACK TABLE targ_mas TO TIMESTAMP SYSDATE - 1;
FLASHBACK TABLE prod_targ TO TIMESTAMP SYSDATE - 1;

If these changes were already committed and you do not have flashback enabled, I'm afraid your only option would be to recover from backup.