oracle,sqlserver,MySQL數據庫語句對照表

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        =    oracle,sqlserver,MySQL數據庫語句對照表      =
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-- 創建表語句
 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 '這是column1的註釋';
 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 '註釋',
    `column2` VARCHAR(30) not null COMMENT '註釋',
    PRIMARY KEY (`column1`)   -- 主鍵定義也可放在此處
  )ENGINE=InnoDB  DEFAULT CHARSET=gbk;

-- 修改字段語句
 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`;

-- 創建刪除索引語句，索引只能刪除重建，不能修改
 ORACLE:
  -- 主鍵索引
  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;
  -- 刪除索引
  drop index index_name;
 SQLSERVER:
  -- 主鍵索引
  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 關鍵字
  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
  -- 刪除索引
  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);
  -- 主鍵索引
  ALTER TABLE _table_name ADD PRIMARY KEY index_name  (column_list);
  -- 刪除索引
  alter table _table_name drop index index_name;

-- 插入語句
 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');-- 可以插入多條記錄

-- 修改表名
 ORACLE:
  alter table leave rename to Leave01;
 SQLSERVER:
  EXEC sp_rename leave,leave01;
 MYSQL:
  alter table `leave` RENAME to `leave01`;
-- 刪除表語句
 ORACLE:
  drop table table_name;
 SQLSERVER:
  drop table table_name;
 MYSQL:
  drop table table_name
-- 刪除所有表的語句
 SQLSERVER:
  exec sp_msforeachtable 'drop table ?';
-- 修改列名
 SQLSERVER:
  EXEC sp_rename '表名.列名','新列名','column';
-- 刪除記錄
 ORACLE:
  delete (from) tablename where _column_name=?;