1.2:Adding aPrimary Key Constraint to an Existing Table In this recipe, I’ll demonstrate how to add aprimary key to an existing table using ALTER TABLEand ADDCONSTRAINT:ALTERTABLEPerson.EducationTypeADDCONSTRA
用下面的T-SQL语句建立一个基本表:CREATE TABLE Student(Sno CHAR(4) PRIMARY KEY,Sname CHAR(8) NOT NUL
5: create table #table (empidint, empname varchar (25),Department varchar (25) ,Salaryint) 6: create clustered index #table_index1 on #table (empid asc ) 7: create nonclustered index #table_index2 on #table (Salary) include (Department,empid ) 8: insert into #table select S.empid,...
CREATE TABLE dbo.SalesOrder ( SalesOrderId integer not null IDENTITY PRIMARY KEY NONCLUSTERED, CustomerId integer not null, OrderDate datetime not null ) WITH (MEMORY_OPTIMIZED = ON, DURABILITY = SCHEMA_AND_DATA); 針對記憶體最佳化資料表的 Transact-SQL INSERT 和 SELECT 陳述式與一般...
CREATE TABLE database_name.schema_name.table_name ( col1 datatype [NULL | NOT NULL], col2 datatype [NULL | NOT NULL], ... ) Here, the syntax uses the CREATE TABLE statement to create a new table with a specified existing schema and in the specified existing database name. This tab...
{ DEFAULT constant_expression | PRIMARY KEY NONCLUSTERED NOT ENFORCED -- Applies to Azure Synapse Analytics only | UNIQUE NOT ENFORCED -- Applies to Azure Synapse Analytics only } <table_option> ::= { CLUSTERED COLUMNSTORE INDEX -- default for Azure Synapse Analytics...
Feature FOREIGN KEY Applies to: Azure SQL Database and SQL Server starting SQL Server 2016 (13.x)For memory-optimized tables, FOREIGN KEY constraints are only supported for foreign keys referencing primary keys of other memory-optimized tables. Remove the constraint from the table definition if th...
Add Time in SQL HH:MM:SS to another HH:MM:SS Adding a column to a large (100 million rows) table with default constraint adding a extra column in a pivot table created uisng T-SQL Pivot Table query Adding a partition scheme to an existing table. Adding a Value to a 'date' Column...
object. For more information, see sp_addlinkedserver (Transact-SQL). A four-part name that is constructed by using the OPENDATASOURCE function as the server part of the name can also be used to specify the remote table source. When OPENDATASOURCE is specified, database_name and schema_name ...
Feature FOREIGN KEY Applies to: Azure SQL Database and SQL Server starting SQL Server 2016 (13.x)For memory-optimized tables, FOREIGN KEY constraints are only supported for foreign keys referencing primary keys of other memory-optimized tables. Remove the constraint from the table definition if th...