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sqlserver表结构修改方法 - 站长搜索
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sqlserver表结构修改方法

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2022-09-23 17:18:42 转载来源: 网络整理/侵权必删

如果我们需要修改sqlserver表结构,应该怎么做呢?下面就将教您如何修改sqlserver表结构的方法,希望对您学习sqlserver表结构方面能够有所帮助。向sqlserver表中增加一个varchar列:ALTERTABLEdistributorsADDCOLUMNaddressvarchar(30);从sqlserver表中删除一个字段:ALTERTABLEdistributorsDROPCOLUMNaddressRESTRICT;在一个操作中修改两个现有字段的类型:ALTERTABLEdistributorsALTERCOLUMNaddressTYPEvarchar(80),ALTERCOLUMNnameTYPEvarchar(100);使用一个USING子句,把一个包含UNIX时间戳的integer字段转化成timestampwithtimezone:ALTERTABLEfooALTERCOLUMNfoo_timestampTYPEtimestampwithtimezoneUSINGtimestampwithtimezone'epoch'+foo_timestamp*in

如果我们需要修改sql server表结构,应该怎么做呢?下面就将教您如何修改sql server表结构的方法,希望对您学习sql server表结构方面能够有所帮助。

向sql server表中增加一个varchar列
ALTER TABLE distributors ADD COLUMN address varchar(30);
从sql server表中删除一个字段:
ALTER TABLE distributors DROP COLUMN address RESTRICT;
在一个操作中修改两个现有字段的类型:
ALTER TABLE distributors
ALTER COLUMN address TYPE varchar(80),
ALTER COLUMN name TYPE varchar(100);
使用一个 USING 子句, 把一个包含 UNIX 时间戳的 integer 字段转化成 timestamp with time zone:
ALTER TABLE foo
ALTER COLUMN foo_timestamp TYPE timestamp with time zone
USING
timestamp with time zone 'epoch' + foo_timestamp * interval '1 second';

对现存字段改名
ALTER TABLE distributors RENAME COLUMN address TO city;
更改现存sql server表的名字:
ALTER TABLE distributors RENAME TO suppliers;
给一个字段增加一个非空约束:
ALTER TABLE distributors ALTER COLUMN street SET NOT NULL;
从一个字段里删除一个非空约束:
ALTER TABLE distributors ALTER COLUMN street DROP NOT NULL;
给一个表增加一个检查约束:
ALTER TABLE distributors ADD CONSTRAINT zipchk CHECK (char_length(zipcode) = 5);
删除一个表和它的所有子表的监查约束:
ALTER TABLE distributors DROP CONSTRAINT zipchk;

向表中增加一个外键约束
ALTER TABLE distributors ADD CONSTRAINT distfk FOREIGN KEY (address) REFERENCES addresses(address) MATCH FULL;
给表增加一个(多字段)唯一约束:
ALTER TABLE distributors ADD CONSTRAINT dist_id_zipcode_key UNIQUE (dist_id, zipcode);
给一个表增加一个自动命名的主键约束,要注意的是一个表只能有一个主键:
ALTER TABLE distributors ADD PRIMARY KEY (dist_id);
把表移动到另外一个表空间:
ALTER TABLE distributors SET TABLESPACE fasttablespace;

标签: sqlserver 结构 修改 方法


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