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-- 创建表语句

ORACLE:

create table _table_name(

column1 varchar2(10) primary key,

column2 number(5) not null,

memo varchar2(100)

);

comment on column _table_name.column1

is '这是column1的注释';

SQLSERVER:

create table _table_name(

column1 varchar(10) primary key,

column2 int not null,

memo varchar(100)

);

MYSQL:

create table `_table_name`

(

`column1` VARCHAR(32) primary key COMMENT '注释',

`column2` VARCHAR(30) not null COMMENT '注释',

PRIMARY KEY (`column1`) -- 主键定义也可放在此处

)ENGINE=InnoDB DEFAULT CHARSET=gbk;

-- 修改字段语句

ORACLE:

alter table _table_name add/modify column_name varchar2(505);

alter table _table_name drop column column_name;

SQLSERVER:

alter table _table_name add column_name VARCHAR(20);

alter table _table_name alter column column_name varchar(2000);

alter table _table_name drop column column_name;

MYSQL:

alter table _table_name add/modify column column_name varchar(2000);

alter table _table_name drop `column_name`;

-- 创建删除索引语句，索引只能删除重建，不能修改

ORACLE:

-- 主键索引

alter table _table_name add constraint index_name primary key (column_name) using index tablespace URMSPK;

-- 普通列索引

create index index_name$cl2 on _table_name (column1_name,column2_name DESC) tablespace URMSIDX;

-- 删除索引

drop index index_name;

SQLSERVER:

-- 主键索引

Alter table _table_name add primary key(column_name);

alter table _table_name add constraint index_name primary key CLUSTERED (column_name)

WITH (

PAD_INDEX = OFF,

IGNORE_DUP_KEY = OFF,

STATISTICS_NORECOMPUTE = OFF,

ALLOW_ROW_LOCKS = ON,

ALLOW_PAGE_LOCKS = ON)

ON URMSPK

go

-- 普通列索引 ,非唯一索引需要去掉 UNIQUE NONCLUSTERED 关键字

CREATE UNIQUE NONCLUSTERED INDEX [index_name] ON [_table_name]

([ORGRANGE], [SHOWORDER] DESC)

WITH (

PAD_INDEX = OFF,

IGNORE_DUP_KEY = OFF,

DROP_EXISTING = OFF,

STATISTICS_NORECOMPUTE = OFF,

SORT_IN_TEMPDB = OFF,

ONLINE = OFF,

ALLOW_ROW_LOCKS = ON,

ALLOW_PAGE_LOCKS = ON)

ON [URMSIDX]

GO

-- 删除索引

drop index _table_name.idxname;

MYSQL:

-- 普通索引

ALTER TABLE _table_name ADD INDEX index_name (APPID, CREATEDATE DESC);

-- 唯一索引

ALTER TABLE _table_name ADD UNIQUE index_name (column_list);

-- 主键索引

ALTER TABLE _table_name ADD PRIMARY KEY index_name (column_list);

-- 删除索引

alter table _table_name drop index index_name;

-- 插入语句

ORACLE:

insert into _table_name (column_list) values ('value_list');

SQLSERVER:

insert into _table_name (column_list) values ('value_list');

MYSQL:

insert into UMFRAMESET (`column_list`) values ('value_list'),('value_list2');-- 可以插入多条记录

-- 修改表名

ORACLE:

alter table leave rename to Leave01;

SQLSERVER:

EXEC sp_rename leave,leave01;

MYSQL:

alter table `leave` RENAME to `leave01`;

-- 删除表语句

ORACLE:

drop table table_name;

SQLSERVER:

drop table table_name;

MYSQL:

drop table table_name

-- 删除所有表的语句

SQLSERVER:

exec sp_msforeachtable 'drop table ?';

-- 修改列名

SQLSERVER:

EXEC sp_rename '表名.列名','新列名','column';

-- 删除记录

ORACLE:

delete (from) tablename where _column_name=?;

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