create cursor in oracle

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

1. IntroductionSQL is a collection-oriented language, and the result is generally a collection (with multiple records), and the PL-SQL variable is a scalar, a set of variables can only hold one record at a time. Many times the number of records for

1. What is a cursor?① Retrieve the result set from the table and point to a record for interaction at a time.② Operations in relational databases are performed on the complete set of rows.The row set returned by the SELECT statement includes all

1, what is a cursor? ① retrieves the result set from the table, and the mechanism from which each point points to a record for interaction.The operations in the ② relational database are performed on the complete rowset.The rowset returned by the

Cursor is a complex concept in the database field, because it contains shared cursor and session cursor. The two have different concepts and forms.The concept of shared cursor is easy to confuse with the cursor defined in SQL statements. This

Transferred from: http://developer.hi.baidu.com/#/detail/15344654this day's simple summary of the usage of cursor (cursor/cursor) in pl/ SQL. I believe many DBAs who are engaged in development or maintenance have encountered similar face-to-face

The difference among Cursor, hidden Cursor, and dynamic Ref Cursor is displayed in PLSQL. plsqlref1. Explicit cursorExplicit is relative to implicit cursor, that is, there is a clear declared cursor. The declaration of an explicit cursor is similar

Detailed description of Oracle CURSOR instance, oraclecursor CURSORI,Cursor Overview Cursor is a data buffer provided by the database system in the memory. It stores the execution results of SQL statements. Each cursor has a name. You can use SQL

Today, we will briefly summarize the usage of cursor in PL/SQL. I believe many DBAs who are engaged in development or maintenance have encountered similar face-to-face problems when looking for a job: Please briefly describe the type of the cursor,

1. What is a cursor?① Retrieve the result set from the table and point to a record for interaction at a time.② Operations in relational databases are performed on the complete set of rows.The row set returned by the SELECT statement includes all