表数据备份到另一张表：select * into destTbl from srcTbl
条件：destTbl表不存在
insert into destTbl(fld1, fld2) select fld1, 5 from srcTbl
条件：destTbl表存在
修改数据库列数据类型：
alter table [table name] modify [column name] varchar(32) null
增加列：alter table [table name] add [column name] varchar(10) null
删除列：
alter table [table name] drop [column name]
同时修改多列：
update [table name] set [column1]=[value1], [column2]=[value2] where ......
DerbyDB创建自增字段：
CREATE TABLE MAPS
(
MAP_ID INTEGER NOT NULL GENERATED ALWAYS AS IDENTITY (START WITH 1, INCREMENT BY 1),
MAP_NAME VARCHAR(24) NOT NULL,
REGION VARCHAR(26),
AREA DECIMAL(8,4) NOT NULL,
PHOTO_FORMAT VARCHAR(26) NOT NULL,
PICTURE BLOB(102400),
UNIQUE (MAP_ID, MAP_NAME)
)
BCP命令：
bcp {db_name}.dbo.{tablename} out {filename}.bcp -I{interface_name} -S{db_name_in_interface} -U{user_name} -P{password} -c -t"|" -Y
bcp {db_name}.dbo.{tablename} in {filename}.bcp -I{interface_name} -S{db_name_in_interface} -U{user_name} -P{password} -c -t"|" -Y
Interface definition:
{db_name_in_interface}
master tcp ether {db_server_name} {port}
query tcp ether {db_server_name} {port}
posted on 2011-11-04 14:20
DLevin 阅读(1430)
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