Types of fields in Oracle that modify existing data

Source: Internet
Author: User

The original field type is VARCHAR2, in fact, are numbers, you want to change the field type to number, error Ora-01439:column to be modified must is empty to changes datatype


TableName is the table name, ColName is the name of the field to be modified

Alter TableTableNameAddTempcolumnvarchar2( -);--Add temporary field TempcolumnUpdateTableNameSetTempcolumn=ColName;--Copy the original field data into a temporary fieldUpdateTableNameSetColName=NULL;--empty the original field dataAlter TableTableName Modify (Colnamenumber);--Modify the original field type to numberUpdateTableNameSetColName=Tempcolumn;--Copy temporary field data to the modified original fieldAlter TableTableNameDrop columnTempcolumn;--Delete temporary fields

Types of fields in Oracle that modify existing data

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