cursor test

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

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 SQL, the results are stored in a memory area, and the results are often a collection containing

SQL is the language used to access the Oracle database. PL/SQL expands and enhances SQL functions. It also introduces stronger Program Logic. PL/SQL supports DML commands and SQL transaction control statements. DDL is not supported in PL/SQL, which

SQL is the language used to access the Oracle database. PL/SQL expands and enhances SQL functions. It also introduces stronger Program Logic. PL/SQL supports DML commands and SQL transaction control statements. DDL is not supported in PL/SQL, which

Problems encountered at work: 1. There is a custom dictionary table: mdl_class_js This table stores the names of many other tables (called resource tables). (In the mdl_class_js table, fields: table_name are used to represent these resource

Query The SELECT statement is used to query data from the database. When the SELECT statement is used in PL/SQL, it must be used with the into clause. The return value of the query is assigned to the variable in the into clause, variable declaration

When Oracle Database executes a SQL statement, it stores the result set and processing information in an unnamedprivate SQ L area. A pointer to the unnamed area, called acursor, lets youretrieve the rows of the result set one at a time.Cursor

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

css| Cursor | control | Web page CSS allows you to control all aspects of the page's appearance and layout-including fonts, margin margins, and cursors. Yes, starting with CSS 2.1, you can easily control the cursors that users use when browsing the

An Oracle cursor is divided into a display cursor and an implicit cursor. Display cursor (Explicit Cursor): A cursor defined in a PL/SQL program, used for querying, is called a display cursor.Implicit cursors (implicit Cursor): A cursor that is