fetch cursor

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SQL _ cursor Summary

Original: http://ntk2006.blog.sohu.com/135331235.html Cursor ConceptCursors provide a flexible way to retrieve and operate data from tables. cursors are mainly used on servers to process SQL statements sent from clients to servers, or data

SQL Server cursor

I. cursor Recognition Cursor allows you to access the result set returned by SQL Server row by row.A major reason for using cursor is to convert the set operation into a single record processing method.After retrieving data from a database using

Show cursor FETCH data

-In Oracle, when we execute a SELECT statement from Pl/sql, the Oracle RDBMS (relational database management system) assigns a private SQL zone to the SGA shared pool for that statement. --At the same time, put the query result set into the system

Oracle Database: PL/SQL cursor overview, oraclepl

Oracle Database: PL/SQL cursor overview, oracleplI. cursor Concept Literally, it refers to a swimming cursor, which is a handle or pointer pointing to the context area. When performing the CRUD operation in the PL/SQL block, ORACLE allocates a

Using fetch bulk collect into to read cursor data in batch in Oracle

Usually we obtain cursor data in the form of fetch some_cursor into var1 and var2. When there are not many records in the cursor, It is not tight. However, since Oracle 8i, Oracle has provided fetch bulk collect to fetch data in the cursor in

SQL cursor (cursor) details and internal loop usage examples

CursorA cursor is a data buffer opened by the system for the user, which holds the results of the SQL statement execution. Each cursor area has a name that allows the user to retrieve the record from the cursor one at a-and assign it to the main

Oracle implicit cursors, display cursors, cursor loops, dynamic SELECT statements and dynamic cursors, exception handling, custom exceptions ____oracle

The concept of cursors: A cursor is a memory workspace of SQL that is defined by the system or user as a variable. The role of a cursor is to temporarily store blocks of data that are extracted from the database. In some cases, the data needs to be

Explicit cursor, implicit cursor, and dynamic ref cursor in PLSQL

Today, we will briefly summarize the usage of cursor in PL/SQL. Cursor category: -- Explicit cursor-- Static cursor | | -- Implicit cursorCursor |-- Strong type (Restriction), specifying the return type-- Dynamic Cursor -- ref cursor |-- Weak type

Oracle Database PL/SQL cursor learning Notes

1. Cursor conceptLiterally, it refers to a swimming cursor, which is a handle or pointer pointing to the context area.When performing the CRUD operation in the PL/SQL block, ORACLE allocates a context zone for it in the memory. The database language

Oracle cursor (cursor)

  SQL code -- Ref cursor /* Show multiple rows of a cursor Implicit cursor data manipulation language DML and single-line select into statement 1. Define a cursor Select result set statement corresponding to the cursor CURSOR cursor_name IS

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