Oracle - related additions and deletions

- After the additions and deletions to modify the database SQL statement is finished, will not immediately be written to the database, but also need to manually submit the data 
- if the data in question can also roll back 

- the primary key: in a table, a field the only non-null value, this field as the primary key, a function is unique identification data 

- to increase the data 
- INSERT INTO table name (field 1, field 2, ...) values (value 1, value 2, ...) 
- the primary key value must be given to allow for the NULL fields can not give value 
- insert the statement after the table name in the field is to conduct a field assignment, fields, and values must be one to one, fields and values have the same order and number 
- if the whole field is inserted, may be omitted fields were 
- iNSERT INTO table values (value 1, value 2, ...) 

- delete data 
- delete from table: delete All data in the table 
- the delete from table where conditions: deleted qualified data 
- TRUNCATE the table table name: delete all the data in the table, more efficient than the delete 

- update data 
-update table field name = new set value, the new field name value of 2 = 2, ... WHERE condition 

- Data Backup 
- table-level backup (backup table structure and only the data is not backed up constraints) 
-      all backup: 
-          the Create the table new table as select * from table to back up 
-      a partial backup: 
-          the Create new table as select the table field 1, field 2, ... from the table name to be backed up 
- data whole insert 
-      iNSERT INTO table name insert select * from table name 
-      must be the same number of fields in the query results table names and field into the number of the same type