Oracle insert data

seeing the name of a thing one thinks of its function ,INSERT Used to insert （ add rows ）.

The insert operation can be used in many ways ：

• Insert a single complete line ;
• Insert a single partial line ;
• Insert multiple rows ;
• Insert the result of the query .

Tips ：insert And system security

have access to Oracle Security is disabled on a per table or per user basis INSERT sentence .

1.1 Insert full row

Syntax example ：

INSERT INTO Customers
VALUES(10006,
       'Pep E. LaPew',
       '100 Main Street',
       'Los Angeles',
       'CA',
       '90046',
       'USA',
       NULL,
       NULL);

Be careful ： There is no output

INSERT Statements usually do not produce any output , But if Oracle SQL Developer Execute the above statement in , You should see “1 row inserted.” news .

stay VALUES Clause specifies the data to be stored in each table column , And you must provide a value for each column . If the column is not worth , You should use NULL value （ Assume that the table allows no value to be specified for this column ）. Columns must be filled in the order in the table definition . Writing depends on a particular order SQL Statement is very unsafe .

More secure （ Unfortunately, it is also more troublesome ） The way of writing is as follows INSERT sentence ：

INSERT INTO customers(cust_id,
                      cust_name,
                      cust_address,
                      cust_city,
                      cust_state,
                      cust_zip,
                      cust_country
)
VALUES(10006,
       'Pep E. LaPew',
       '100 Main Street',
       'Los Angeles',
       'CA',
       '90046',
       'USA'
);

Tips ： Automatic primary key

Every time a row is added , There is no need to manually assign unique values （ There is no need to record what value was last used ）, majority DBMS Both provide a way of automatic allocation ： Every time you add a row to a table , Will automatically assign the next available number , This function is called Auto increment .

Because the column name is provided ,VALUES The specified column names must be matched in the specified order , This order is not necessarily the order in which columns appear in the actual table .

Tips ： Always use the list of columns

Usually , If you do not explicitly specify the list of columns , Then never use INSERT.

Warning ： Omit column

If the table definition allows , It can be downloaded from INSERT Omit columns in operation . here , The following conditions must exist ：

• Define the column to allow NULL value
• Specify the default value in the table definition . This means that if no value is specified , The default value will be used .

Tips ： Insert multiple rows

Unlike most others DBMS Different ,Oracle Cannot insert multiple rows at the same time insert edition .

resolvent ：

-- This grammar is an example of error , But in the other DBMS Can be used in 
insert into table_name(colum1, colun2)
values(1,2),(3,4);

-- Proper use ：
1、 use union all Splicing query method ：
insert into CB_PRACTICE(id_, type_,remark)
select 5,' Physics ',' Buoyancy ' from dual
union all select 6,' Physics ',' resistance ' from dual;

2、 use insert all The way ：
INSERT ALL
INTO CB_PRACTICE(id_, type_,remark) VALUES (7,' Chinese language and literature ',' Tang Poetry ')
INTO CB_PRACTICE(id_, type_,remark) VALUES (8,' Chinese language and literature ',' Song lyrics ')
SELECT * FROM DUAL;

2. Insert the retrieved data

INSERT There is another form , Can be used to INSERT The result of the statement is inserted into the table . This is called INSERT SELECT.

INSERT INTO customers(cust_id,
                      cust_contact,
                      cust_email,
                      cust_name,
                      cust_address,
                      cust_city,
                      cust_state,
                      cust_zip,
                      cust_country)
SELECT cust_id,
       cust_contact,
       cust_email,
       cust_name,
       cust_address,
       cust_city,
       cust_state,
       cust_zip,
       cust_country
FROM custnew;

Tips :INSERT SELECT Column name in

For the sake of simplicity , This example is in INSERT and SELECT Use the same column name in the statement , But there is no need for column name matching .