在Oracle SQL中創建默認約束

Question

來自SQL Server，我正在學習一些Oracle語法。

這是我的表DDL

CREATE TABLE "CDR"."EXTDL_REPORTSETS" 
    (
    "ID"    NUMBER(38,0) NOT NULL ENABLE, 
    "SHORTNAME"   NUMBER(38,0) NOT NULL ENABLE, 
    "DESCRIPTION"  NUMBER(38,0) NOT NULL ENABLE, 
    "ASOFSTARTDATETIME" NUMBER(38,0) NOT NULL ENABLE, 
    "ASOFENDDATETIME" NUMBER(38,0) NOT NULL ENABLE, 
    CONSTRAINT "PK_EXTDL_REPORTSETS" PRIMARY KEY ("ID") USING INDEX PCTFREE 10 INITRANS 2 MAXTRANS 255 STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT) TABLESPACE "CDR_DATA" ENABLE 
) 
    PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 NOCOMPRESS LOGGING STORAGE 
    (
    INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT 
) 
    TABLESPACE "CDR_DATA" ; 

我想預設ASOFSTARTDATETIME到SYSDATE。如何在PL/SQL中設置默認約束？

編輯

的數據類型已經得到搞砸了，所以我糾正它。

CREATE TABLE CDR.ExtDL_Reportsets(
    Id     NUMBER(38, 0) NOT NULL, 
    ShortName   VARCHAR2(255) NOT NULL, 
    Description   VARCHAR2(500) NOT NULL, 
    AsOfStartDateTime DATE    NOT NULL, 
    AsOfEndDateTime  DATE, 
    CONSTRAINT PK_ExtDL_Reportsets PRIMARY KEY (Id) 
) 
; 

Answer 1

用途：

ALTER TABLE EXTDL_REPORTSETS 
    MODIFY last_ASOFSTARTDATETIME DATE DEFAULT SYSDATE 

我無法挖掘各10g reference documentation - this is for 11g。

如果你想這樣做在CREATE TABLE語句：

CREATE TABLE "CDR"."EXTDL_REPORTSETS" (
    "ID"    NUMBER(38,0) NOT NULL ENABLE, 
    "SHORTNAME"   VARCHAR2(255) NOT NULL ENABLE, 
    "DESCRIPTION"  VARCHAR2(500) NOT NULL ENABLE, 
    "ASOFSTARTDATETIME" DATE DEFAULT SYSDATE NOT NULL ENABLE, 
    "ASOFENDDATETIME" DATE NOT NULL ENABLE, 
    CONSTRAINT "PK_EXTDL_REPORTSETS" PRIMARY KEY ("ID") USING INDEX PCTFREE 10 INITRANS 2 MAXTRANS 255 STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT) TABLESPACE "CDR_DATA" ENABLE 
) 
PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 NOCOMPRESS LOGGING STORAGE (
    INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT 
) 
TABLESPACE "CDR_DATA" ;