一、建表
CREATE TABLE DM表名(
T_ID bigint not null,
T_DATE date null,
T_TIMESTAMP timestamp(6) null,
T_DATETIME datetime null,
T_TIME time null,
CONSTRAINT PK_DM表名 PRIMARY KEY (T_ID)
);
二、插入数据
BEGIN
FOR v_count IN 1..101 Loop
INSERT INTO DM表名 VALUES(v_count,
CAST(v_count as date),CAST(v_count as timestamp),
CAST(v_count as datetime),CAST(v_count as time)
);
END Loop;
COMMIT;
END;
/
三、其他字段类型
字段类型 | 定义 | 唯一值 | 非唯一值
------整数------------------
bigint | bigint | v_count | 111
byte | byte | v_count | 444
--------字符---------------------------
char | char(20) | v_count | 'nihao'
varchar | varchar(20) | v_count | 'zhongguo'
character | character(20) | v_count | 'nihao'
varchar2 | varchar2(20) | v_count | 'zhongguo'
-------------------------------------------
numeric | numeric(20,5) | v_count||0.88 | 111.11
decimal | decimal(20,5) | v_count||0.88 | 222.22
bit | bit | - | 0 / 1
----------------------------------------------------
float | float | - | 123.001234
real | real | - | 123.4567
double | double | - | 1.201
double precision | double precision | - | 90
-------大字段类-------------------------------
blob | blob | - | hextoraw('16226c6f6231626cf6231626c6f6231626x6f6626c6f6231626c6')
clob | clob| - | 'ffffffCLOB'
binary | binary(20) | - | hextoraw('16226c6f6231626cf6231626c6f6231626x6f6626c6f6231626c6')
varbinary | varbinary(2000) | - |hextoraw('16226c6f6231626cf6231626c6f6231626x6f6626c6f6231626c6')
longvarbinary | longvarbinary(2000) | - | hextoraw('16226c6f6231626cf6231626c6f6231626x6f6626c6f6231626c6')
longvarchar | longvarchar(200) | - | 'ffffffCLOB'
text | text | - |'ffffffCLOB'
image | image | hextoraw('16226c6f6231626cf6231626c6f6231626x6f6626c6f6231626c6')
---------时间类-------------------
date | date |CAST(v_count+43100 as date) | '2018-01-08' / current_timestamp/getdate() /now ()/sysdate/dateadd(day,3,getdate())
datetime | datetime | CAST(v_count as datetime)|'2018-01-08 01:01:01.999999'/current_timestamp/getdate() /now ()/sysdate/dateadd(day,3,getdate())
timestamp | timestamp(6) | CAST(v_count as timestamp)| '2018-01-08 01:01:01.999999'/current_timestamp/getdate() /now ()/sysdate/dateadd(day,3,getdate())
time | time | CAST(v_count as time) | '05:06:08'/curtime /current_timestamp/getdate() /now ()/sysdate/dateadd(day,3,getdate())
注:v_count为自定义循环变量,以便重复插值; - 表示省略; / 表示有多种可选值
选一个举例说明:numeric | numeric(20,5) | v_count||0.88 | 111.11
建表时nemeric字段类型可定义为numeric(20,5); 如果该字段为主键,循环插入值时使用v_count||0.88赋值;该字段不为主键,循环插入值时使用111.11赋值。
四、指定主键字段
建表时指定主键字段的三种方法:
第一种:
CREATE TABLE DM表名(
T_ID bigint primary key not null,
T_DATE date);
第二种:
CREATE TABLE DM表名(
T_ID bigint not null,
T_DATE date,
CONSTRAINT PK_DM表名 PRIMARY KEY (T_ID)
);
第三种:
CREATE TABLE DM表名(
T_ID bigint not null,
T_DATE date);
ALTER TABLE DM表名 ADD CONSTRAINT PK_DM表名 PRIMARY KEY (T_ID);
注:PK_DM表名为约束名
创建联合主键时,在第2和第3种方法中的括号里直接加入需要增加的字段,用逗号隔开。
如:
CONSTRAINT PK_DM表名 PRIMARY KEY (T_ID,T_DATE)
ALTER TABLE DM表名 ADD CONSTRAINT PK_DM表名 PRIMARY KEY (T_ID,T_DATE);
五、其它
六、操作界面