此任务需要在数据库中具有CREATE TABLE权限,对在其中创建表的架构具有 ALTER 权限。 如果CREATE TABLE语句中的任何列被定义为 CLR 用户定义类型,则需要具有对此类型的所有权或 REFERENCES 权限。 如果CREATE TABLE语句中的任何列具有与其关联的 XML 架构集合,则需要具有对 XML 架构集合的所有权或 REFERENCES 权限。
Oracle PL/SQL:CREATE TABLE statement: create a table with primary key.CREATE TABLE statement can be used to create table objects in database. It is possible to add constraints like primary key ,foreign key while table creation.Primary key is the unique identifier for a row of data.One ...
Primary keysare unique identifiers found in a single column or a set of columns that can unambiguously identify every row in a database table. A few rules reflect the technical properties of primary keys: A primary key must use unique values. If the primary key consists of more than one co...
( logical_expression ) ] <column_set_definition> ::= 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 ...
CREATETABLEEmployees(EmployeeIDINTIDENTITY(1,1)PRIMARYKEY,FirstNameNVARCHAR(50)NOTNULL,LastNameNVARCHAR...
( logical_expression ) ] <column_set_definition> ::= 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 ...
单个Transact-SQL 语句在已分区表的单个分区上获取至少 5,000 个锁,并且 ALTER TABLE SET LOCK_ESCALATION 选项设为 AUTO。 数据库引擎实例中的锁数量超出了内存或配置阈值。如果由于锁冲突导致无法升级锁,则每当获取 1,250 个新锁时,数据库引擎便会触发锁升级。Transact...
--Generate ALTER DATABASE ... MODIFY FILEGROUP statements--so that all read-write filegroups grow at the same time.SETNOCOUNTON;DROPTABLEIFEXISTS#tmpdbsCREATETABLE#tmpdbs (idINTIDENTITY(1,1), [dbid]INT, [dbname] sysname, isdoneBIT);DROPTABLEIFEXISTS#tmpfgsCREATETABLE#tmpfgs (idINTIDENTITY...
awaitknex.schema.createTable('example',(tableBuilder)=>{tableBuilder.string('id',64).primary();}); with error: Error: UNKNOWN_CODE_PLEASE_REPORT: Unable to create or change a table without a primary key, when the system variable 'sql_require_primary_key' is set. Add a primary key to...
1.语法:ALTER TABLE 表名 ADD CONSTRAINT 主键名 PRIMARY KEY 表名(主键字段); 3.添加外键 1.语法:ALTER TABLE 表名 ADD CONNSTRAINT 外键名 FOREIGN KEY(外键字段) REFERENCES 关联表名(关联字段); 4.插入单(多)条数据记录(和SQL Server相同,但是不能用select多列添加数据) ...