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
SQL CREATE TABLE Statement Syntax CREATE TABLE <table_name> ( <column_name1> <datatype1> <constraint1> <column_name2> <datatype2> <constraint2> <constraint-list> ) The number of characters that can make up SQL table names and column names varies by DBMS. In many cases the limit...
因为从实际应用的角度来说,在PLSQL中用到数组的几率不是很大。这主要是由于PLSQL跟数据库的紧密结合特性所决定的,数据库的表可以很轻易得实现基本的数组功能。当然这是我个人的一点理解,不一定正确。下面是详细介绍 1、PLSQL中的数组共分三类: I - 嵌套表(Nested tables) TYPE nested_type IS TABLE OF VARCHAR...
sql alter table语句:添加、修改或删除操作 ALTER TABLE语句:用于对已有的表中进行添加、修改或删除操作。 1、修改表名:alter table onetest rename to test; 2、添加列:alter table table_name add column col_name datatype; 3、修改列名:alter table table_name change old_name new_name ... ...
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The name of a column to create in the new table. data_type The data type of the column. This can include array specifiers. For more information on the data types included with EDB Postgres Advanced Server, seeSQL reference. DEFAULT default_expr ...
geovindu (set in TOAD Options, Procedure Editor) Table : BookPlaceList (set in the "New PL/SQL Object" dialog)***/ BEGIN --tmpVar := ""; select BookPlaceName into tmpVarfrom BookPlaceList where BookPlaceID=kid; RETURN tmpVar; EXCEPTION WHEN NODATA_FOUNDTHEN NULL;WHEN ...
13 SQL Statements: COMMIT to CREATE JAVA 14 SQL Statements: CREATE LIBRARY to CREATE SCHEMA 15 SQL Statements: CREATE SEQUENCE to DROP CLUSTER CREATE SEQUENCE CREATE SPFILE CREATE SYNONYM CREATE TABLE CREATE TABLESPACE CREATE TABLESPACE SET CREATE TRIGGER CREATE TYPE CREATE TYPE BODY CREATE USER CREAT...
So a statement may fail if a change in the SQL_MODE renders it invalid. For example: CREATE OR REPLACE TABLE x (d DATE DEFAULT '0000-00-00'); SET SQL_MODE='NO_ZERO_DATE'; CREATE OR REPLACE TABLE y LIKE x; ERROR 1067 (42000): Invalid default value for 'd' CREATE TABLE ......
CREATE SEQUENCE adds a sequence to the current database. The owner of a sequence is the user who creates the sequence.A sequence is a special table that stores arithmetic