If nullability isn't specified, all columns participating in a PRIMARY KEY constraint have their nullability set to NOT NULL.PermissionsCreating a new table with a primary key requires CREATE TABLE permission in the database and ALTER permission on the schema in which the table is being created....
= column_set_name XML COLUMN_SET FOR ALL_SPARSE_COLUMNS <table_constraint> ::= [ CONSTRAINT constraint_name ] { { PRIMARY KEY | UNIQUE } [ CLUSTERED | NONCLUSTERED ] ( column_name [ ASC | DESC ] [ ,... n ] ) [ WITH FILLFACTOR = fillfactor | WITH ( <index_option> [ ,... ...
= column_set_name XML COLUMN_SET FOR ALL_SPARSE_COLUMNS <table_constraint> ::= [ CONSTRAINT constraint_name ] { { PRIMARY KEY | UNIQUE } [ CLUSTERED | NONCLUSTERED ] ( column_name [ ASC | DESC ] [ ,... n ] ) [ WITH FILLFACTOR = fillfactor | WITH ( <index_option> [ ,... ...
本地临时表的名称前面有一个数字符号 (#table_name),而全局临时表的名称前面有两个数字符号 (##table_name)。 SQL 语句使用 CREATE TABLE 语句中为 table_name 指定的值引用临时表,例如: 如果在单个存储过程或批处理中创建了多个临时表,则它们必须有不同的名称。 如果本地临时表由存储过程创建或由多个用户同...
To create a table with a primary key, we can write the following command. In MySQL CREATETABLECompanies (idint,namevarchar(50), addresstext, emailvarchar(50), phonevarchar(10), PRIMARYKEY(id) ); In Oracle and SQL Server CREATETABLECompanies (idintNOTNULLPRIMARYKEY,namevarchar(50), ...
syntaxsql 複製 CREATE VIEW [ schema_name . ] view_name [ ( column_name [ ,...n ] ) ] AS <select_statement> [;] <select_statement> ::= [ WITH <common_table_expression> [ ,...n ] ] SELECT <select_criteria> Microsoft網狀架構數據倉儲和 SQL 分析端點的語法。 syntaxsql 複製 CR...
syntaxsql 複製 CREATE VIEW [ schema_name . ] view_name [ ( column_name [ ,...n ] ) ] AS <select_statement> [;] <select_statement> ::= [ WITH <common_table_expression> [ ,...n ] ] SELECT <select_criteria> Microsoft網狀架構數據倉儲和 SQL 分析端點的語法。 syntaxsql 複製 CR...
In the following example, a new table is created with system-versioning enabled without defining the name of the history table. SQL Copy CREATE TABLE Department ( DeptID INT NOT NULL PRIMARY KEY CLUSTERED, DeptName VARCHAR(50) NOT NULL, ManagerID INT NULL, ParentDeptID INT NULL, ValidFrom ...
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SQL --Create the tables and insert the values.CREATETABLEdbo.SUPPLY1 ( supplyIDINTPRIMARYKEYCHECK(supplyIDBETWEEN1and150), supplierCHAR(50) );CREATETABLEdbo.SUPPLY2 ( supplyIDINTPRIMARYKEYCHECK(supplyIDBETWEEN151and300), supplierCHAR(50) );CREATETABLEdbo.SUPPLY3 ( supplyIDINTPRIMARYKEYCHECK(sup...