%msg&sql(CREATEGLOBALTEMPORARYTABLETempEmp(EMPNUMINTNOTNULL,NAMELASTCHAR(30)NOTNULL,NAMEFIRSTCHAR(30)NOTNULL,CONSTRAINTEMPLOYEEPKPRIMARYKEY(EMPNUM)))ifSQLCODE=0{w!,"表创建"}else{w!,"SQLCODE=",SQLCODE,": ",%msg}}
Index DDLBEIndex [ Extent, SqlName = "%%DDLBEIndex", Type = bitmap ]; /// DDL Primary Key Specification Index PatientPK On PatNum [ PrimaryKey, SqlName = Patient_PK, Type = index, Unique ]; } CREATE TABLE中指定的字段名称在class属性中显示为SqlFieldName值。 在动态选择操作期间, IRIS...
= 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> [ ,... ...
= 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> [ ,... ...
UNIQUE: This constraint ensures that the query inserts only unique values in the column on which the constraint has been created. CHECK: When we insert a record in a table, the check constraint ensures that the values that we are inserting in a column must satisfy the condition specified in...
CREATE TABLE 中指定的表的存储机制以后不能进行更改。 ON {<partition_scheme> | filegroup | “default”} 也可在 PRIMARY KEY 约束或 UNIQUE 约束中指定。这些约束会创建索引。如果指定了 filegroup,则索引将存储在命名的文件组中。如果指定了 "default",或者根本未指定 ON,则索引将与表存储在同一文件组中。
ALTER TABLE文でMODIFY句を指定すると、既存の列またはパーティションの定義を変更できます。 関連項目: オブジェクトの作成の詳細は、『Oracle Database管理者ガイド』および「CREATE TYPE」を参照してください。 表の変更および削除の詳細は、「ALTER TABLE」および「DROP TABLE」を参照してくださ...
UNIQUE [KEY] index_parameters UNIQUE ( column_name [, ... ] ) index_parameters UNIQUE约束表示表里的一个字段或多个字段的组合必须在全表范围内唯一。 对于唯一约束,NULL被认为是互不相等的。 UNIQUE KEY只能在sql_compatibility='MYSQL'时使用,与UNIQUE语义相同。 PRIMARY KEY index_parameters PRIMARY KE...
("Northwind.mdb")' Create a table with three fields and a unique' index made up of all three fields.dbs.Execute"CREATE TABLE MyTable "_ &"(FirstName CHAR, LastName CHAR, "_ &"DateOfBirth DATETIME, "_ &"CONSTRAINT MyTableConstraint UNIQUE "_ &"(FirstName, LastName, DateOfBirth));...