2. CREATE TEMPORARY TABLE ptemp(longitude double, latitude double); 3. INSERT INTO ptemp SELECT longitude, latitude FROM china; 4. DROP TABLE china; 5. CREATE TABLE china(id INTEGER PRIMARY KEY AUTOINCREMENT, longitude double, latitude double); 6. INSERT INTO china(longitude, latitude) SELECT ...
接下来要使用的的IDENTITY值可以通过语句ALTER TABLE ALTER COLUMN <columnname> RESTART WITH <new value>;来设置。 2.5.2 序列 SQL200n语法和用法和现有的大多数据库引擎所支持的是有区别的。可以通过命令CREATE SEQUENCE创建Sequences,并且可以通过命令ALTER SEQUENCE在任何时候进行修改它 们的当前值。一个sequence的...
WHEREsome_column=some_value; DELETEFROM[dbo].[Test]WHEREID='7' *注当要删除表中内容时可以用 DELETE FROMtable_name;或DELETE * FROMtable_name; 三、高级 1.SQL SELECT TOP 1)SQL: SELECT TOPnumber|percentcolumn_name(s) FROMtable_name; SELECTTOP30PERCENT*FROM[dbo].[Test] --选取前30%的数据...
AlterAvailabilityGroupStatementType AlterBrokerPriorityStatement AlterCertificateStatement AlterCertificateStatementKind AlterColumnAlterFullTextIndexAction AlterColumnEncryptionKeyStatement AlterCreateEndpointStatementBase AlterCreateServiceStatementBase AlterCredentialStatement AlterCryptographicProviderStatement ...
CREATE TABLE MyCustomers (CustID INTEGER IDENTITY (100,1) PRIMARY KEY, CompanyName NvarChar (50)) INSERT INTO MyCustomers (CompanyName) VALUES ('A. Datum Corporation') ALTER TABLE MyCustomers ALTER COLUMN CustId IDENTITY (200, 2) B. 为列添加默认值 ...
Learn more about the Microsoft.SqlServer.TransactSql.ScriptDom.AlterTableAlterColumnStatement.AlterTableAlterColumnStatement in the Microsoft.SqlServer.TransactSql.ScriptDom namespace.
CREATE TABLE MyCustomers (CustID INTEGER IDENTITY (100,1) PRIMARY KEY, CompanyName NvarChar (50)) INSERT INTO MyCustomers (CompanyName) VALUES ('A. Datum Corporation') ALTER TABLE MyCustomers ALTER COLUMN CustId IDENTITY (200, 2) B. 为列添加默认值 ...
CREATE TABLE MyCustomers (CustID INTEGER IDENTITY (100,1) PRIMARY KEY, CompanyName NvarChar (50)) INSERT INTO MyCustomers (CompanyName) VALUES ('A. Datum Corporation') ALTER TABLE MyCustomers ALTER COLUMN CustId IDENTITY (200, 2) B. 为列添加默认值 ...
The DataType has to be null for this to be AddRowguidcol or DropRowguidcol. (?)PERSISTED used only in 2005" C# 複製 public Microsoft.SqlServer.TransactSql.ScriptDom.AlterTableAlterColumnOption AlterTableAlterColumnOption { get; set; } Property Value AlterTableAlte...
The DataType has to be null for this to be AddRowguidcol or DropRowguidcol. (?)PERSISTED used only in 2005" C# 複製 public Microsoft.SqlServer.TransactSql.ScriptDom.AlterTableAlterColumnOption AlterTableAlterColumnOption { get; set; } Property Value AlterTableAlter...