Elapsed:00:00:00.0019:11:09SYS@zkm(31)>insertintozkm.testvalues(2,'a',to_date('2001-01-01','yyyy-mm-dd'));1row created. Elapsed:00:00:00.0119:11:09SYS@zkm(31)>insertintozkm.testvalues(3,'a',to_date('2002-01-01','yyyy-mm-dd'));1row created. Elapsed:00:00:00.0019:11:09...
Name Type Nullable Default Comments --- --- --- --- --- DEPTNO NUMBER(2) Y DNAME VARCHAR2(14) Y LOC VARCHAR2(13) Y 修改表的列名: SQL> alter table users rename column ID to PID; 修改表的列的字符大小 SQL> alter table student modify class varchar2(10); 创建主键: SQL> alter ta...
Because when you change a column from nullable to non-nullable, you must ensure that the existing data meets the new constraint. To fix this, we update the values for theemailcolumn first: UPDATEaccountsSETemail =LOWER(first_name ||'.'|| last_name ||'@oracletutorial.com') ;Code language...
String CHANGE_PERCENT 変更率の列名。 String TREND トレンドの列名。 String OBJECT_CONTEXT オブジェクト・コンテキストの列名。 String STATUS_INFO ステータス情報の列名。 String OWNER 所有者の列名。 String DIMENSION_CONTEXT ディメンション・コンテキストの列名。 String CUSTOM_COLUMN1 カスタ...
Name Type Nullable Default Comments --- --- --- --- --- DEPTNO NUMBER(2) Y DNAME VARCHAR2(14) Y LOC VARCHAR2(13) Y 修改表的列名: SQL> alter table users rename column ID to PID; 修改表的列的字符大小 SQL> alter table student modify class varchar...
change_vector$$ raw(255) y change_vector$$记录dml操作发生在那个或那几个字段上 --当创建物化视图日志使用primary key时,oracle创建临时表 RUPD$_基础表 sql> desc rupd$_test_id; name type nullable default comments --- --- --- --- --- id number y dmltype$$ varchar2(1) y snapid integ...
SQL> desc dept_copy2; Name Type Nullable Default Comments --- --- --- --- --- DEPTNO NUMBER(2) Y DNAME VARCHAR2(14) Y LOC VARCHAR2(13) Y 复制代码 1. 2. 3. 4. 5. 6. 7. 5.5 修改表的列名 SQL> alter table users rename column ID to PID; 复制代码 1. 2. 5.6 修改表的...
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of three Oracle Identity types. The Identity attribute-associated column will use the server-generated value duringINSERT: hence, application developers no longer need to create a sequence nor trigger. If the .NET application attempts to set the Identity attribute itself, this value will be ignored...
LAST_CHANGEDatetime上次啟用或停用條件約束的時間。 INDEX_OWNERString擁有索引的使用者名稱。 INDEX_NAMEString索引的名稱。 ForeignKeyColumns ColumnNameDataType描述 OWNERString條件約束定義的擁有人。 CONSTRAINT_NAMEString條件約束定義的名稱。 TABLE_NAMEString具有條件約束定義的資料表名稱。