ALTER TABLE table_name ADD (column_1 column_definition, column_2 column_definition, ... column_n column_definition); Example Let's look at an example that shows how to add multiple columns in an Oracle table using the ALTER TABLE statement. For example: ALTER TABLE customers ADD (customer...
修改字段的类型的语法:alter table tablename modify (column datatype [default value][null/not null],….); 删除字段的语法: ALTER TABLE table_name(MODIFY column_name column_type , ... ); 例子: 使用一个SQL语句同时添加三个字段: 代码如下: 1 2 3 4 5 6 7 altertabletest1 add( namevarchar2...
We can also use Oracle "alter table" syntax in dynamic PL/SQL to modify data columns BEGIN SQL_STRING := 'ALTER TABLE '||:TABLE_NAME||' MODIFY '||:COLUMN_NAME||' VARCHAR2(100)'; . . . END;
We can also use Oracle "alter table" syntax in dynamic PL/SQL to modify data columns BEGIN SQL_STRING := 'ALTER TABLE '||:TABLE_NAME||' MODIFY '||:COLUMN_NAME||' VARCHAR2(100)'; . . . END;
Oracle lets you to modify multiple columns at once using the following syntax: ALTER TABLE table_name MODIFY ( column1 action1, column2 action2, ... );Code language: SQL (Structured Query Language) (sql) Oracle ALTER TABLE MODIFY column examples ...
table_name modify column_name datatype; If you are brave you can use a single "alter table" syntax to modify multiple columns: alter table table_name modify ( column1_name column1_datatype, column2_name column2_datatype, column3_name column3_datatype, ...
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Table created. SQL> insert into ziggy select rownum, mod(rownum, 100)+1, ceil(dbms_random.value(0,100)), 'ZIGGY STARDUST' from dual connect by level commit; Commit complete. SQL> exec dbms_stats.gather_table_stats(ownname=>null, tabname=> 'ZIGGY', method_opt=>'FOR ALL COLUMNS SIZE...
You can specify multiple columns in a GROUP BY clause. For example, the following query includes the city and description columns from the employee table in a GROUP BY clause: SQL> -- create demo table SQL> create table Employee( 2 ID VARCHAR2(4 BYTE) NOT NULL, 3 First_Name VARCHAR2(...