obclient> CREATE TABLE tbl8 (col1 INT, col2 INT, col3 INT,CONSTRAINT equal_check1 CHECK(col2 = col3 * 2) ENABLE VALIDATE); Query OK, 0 rows affected 为表ref_t2 指定外键,当 DELETE 操作影响与子表相匹配行的父表中键值时,执行 SET NULL 操作。 obclient> CREATE TABLE ref_t1(c1 INT...
Now, let us understand how we can create a table with a constraint. A table can have the following constraints. NOT NULL: This constraint ensures that a query does not insert a NULL value in a column on which the constraint has been created. UNIQUE: This constraint ensures that the query...
%msg&sql(CREATEGLOBALTEMPORARYTABLETempEmp(EMPNUMINTNOTNULL,NAMELASTCHAR(30)NOTNULL,NAMEFIRSTCHAR(30)NOTNULL,CONSTRAINTEMPLOYEEPKPRIMARYKEY(EMPNUM)))ifSQLCODE=0{w!,"表创建"}else{w!,"SQLCODE=",SQLCODE,": ",%msg}}
= 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> [ ,... ...
基于SQL Server 系统数据类型的别名类型。 必须首先用 CREATE TYPE 语句创建别名数据类型,然后才能将它们用于表定义中。 在 CREATE TABLE 语句中,可以覆盖别名数据类型的 NULL 或 NOT NULL 赋值。 但是,长度规格不能更改;不能在 CREATE TABLE 语句中指定别名数据类型的长度。 CLR 用户定义类型。 必须首先用 CREATE...
SQL Create Table Syntax The syntax for the SQL create table statement is: CREATE[schema_name.]table_name(column_name data_type[NULL|NOTNULL][inline_constraint][DEFAULTdefault_value],...out_of_line_constraints); The parameters or values mentioned in this syntax are: ...
-- 开始复制---建表strSQL := 'CREATE TABLE t_self_evaluation'||'_'||currsnum||'(like t_self_evaluation including constraints including indexes including comments);';EXECUTE strSQL;---添加外键约束strSQL :='alter table t_self_evaluation'||'_'||currsnum||'add constraint FK_T_SELF_E_...
Also, note that we created a table with EmpId column as a Primary Key, meaning EmpId will be Unique and NOT NULL field in all the rows in the Employee table. The following is the illustration of the Employee table in the database....
CREATE FUNCTION (SQL) CREATE FUNCTION (外部) 創建地點 CREATE MATERIALIZED VIEW CREATE RECIPIENT CREATE SCHEMA CREATE SERVER CREATE SHARE CREATE STREAMING TABLE CREATE TABLE 數據表屬性和數據表選項 CREATE TABLE 使用 Hive 格式 CREATE TABLE CONSTRAINT ...