This article is concerned only with databases where the size and usage requirements necessitate use of a database management system.
Here are the steps: DECLARE -- source table cursor (only columns to be updated) CURSOR base_table_cur IS SELECT rowid, col1, col2 FROM base_table; type base_type IS TABLE OF base_table_cur%ROWTYPE INDEX BY PLS_INTEGER; base_tab base_TYPE; -- new data CURSOR new_data_cur IS SELECT row_id, new_col1, new_col2 FROM new_data; type new_data_type IS TABLE OF new_data_cur%ROWTYPE INDEX BY PLS_INTEGER; new_data_tab new_data_TYPE; type row_id_type IS TABLE OF ROWID INDEX BY PLS_INTEGER; row_id_tab row_id_TYPE; TYPE rt_update_cols IS RECORD ( new_col1 new_data.new_col1%type, new_col2 new_data.new_col1 %type ); TYPE update_cols_type IS TABLE OF rt_update_cols INDEX BY PLS_INTEGER; update_cols_tab update_cols_type; dml_errors EXCEPTION; PRAGMA EXCEPTION_INIT(dml_errors, -24381); BEGIN open base_table_cur; open new_data_cur; loop fetch base_table_cur bulk collect into base_tab limit 5000; fetch new_data_cur bulk collect into new_data_tab limit 5000; FOR i in base_tab.
A relational database, more restrictively, is a collection of schemas, tables, queries, reports, views, and other elements.
Database designers typically organize the data to model aspects of reality in a way that supports processes requiring information, such as (for example) modelling the availability of rooms in hotels in a way that supports finding a hotel with vacancies.
A database-management system (DBMS) is a computer-software application that interacts with end-users, other applications, and the database itself to capture and analyze data.
Computer scientists may classify database-management systems according to the database models that they support; the most popular database systems since the 1980s have all supported the relational model - generally associated with the SQL language.
Formally, a "database" refers to a set of related data and the way it is organized.Access to this data is usually provided by a "database management system" (DBMS) consisting of an integrated set of computer software that allows users to interact with one or more databases and provides access to all of the data contained in the database (although restrictions may exist that limit access to particular data).The DBMS provides various functions that allow entry, storage and retrieval of large quantities of information and provides ways to manage how that information is organized.On the other hand, a general-purpose DBMS may introduce unnecessary overhead.Therefore, many systems use a special-purpose DBMS.The two main early navigational data models were the hierarchical model, epitomized by IBM's IMS system, and the CODASYL model (network model), implemented in a number of products such as IDMS.