mysql data dictionary

One, the Oracle data dictionary is composed of the following views mainly:1The user view is prefixed with user_ and is used to record information about the users object2The . All view is prefixed with All_ to record information about the user object and the object information that is authorized to access it3The . DBA view is prefixed with Dba_ to record information for all objects of the DB instance4The . v

Environment: 00:24:16 sys@ORCL (^ω^) select * from v$version where rownum=1;BANNER--------------------------------------------------------------------------------Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Prod To query a table in our system, we first need to find the structural information of the table in the data dictionary. These structural information is stored in the

, intersection, and difference operations. So, if you want to perform some normal collection operations on the keys of the collection, you can use the key view objects directly without first converting them to a set.The dictionary's items () method returns an element view object that contains (key, value) pairs. This object also supports collection operations and can be used to find out which two dictionaries have the same key-value pairs.Although the values () method of the

When creating an Oracle database, some built-in database objects will be created, which can be roughly classified into four categories:1. Data dictionary; 2. Dynamic Performance view; 3. PL/SQL packages; 4. Database event triggers. This note briefly introduces 1 and 2 data dictionaries and dynamic performance views, and introduces some commonly used

PL/SQL Related data dictionaryHttp://www.oracle.com/technetwork/issue-archive/2012/12-nov/o62plsql-1851968.htmlSometimes, we encounter the following issues during the PL/SQL development process:1) What database objects does my program depend on?2) which package calls a subroutine or variable in one of the other packages?3) Which of my sub-program parameters use inappropriate data types?4) Do all my subrouti

Kent PengReprint Please specify source: http://www.cnblogs.com/xieyupeng/p/7145599.htmlFirst, new customers 1. Data dictionaryDictionary items used to enumerate a limited number of items(1) The relationship between the data dictionary and other tables in the table:To build a table statement:CREATE TABLE' base_dict ' (' dict_id ' )varchar( +) not NULLCOMMENT'Data

oracle| Data | Application Example Introduction to Oracle Database Dictionaries Oracle data dictionaries consist of tables and views that store some database objects about database structure information. The database dictionary describes how the actual data is organized. They can be queried like other database tables o

As the name implies, a dictionary is like a dictionary used in reality. When a word or word does not understand it, it is used to look up the dictionary. the dictionary contains the language information we use. data is also loaded with a lot of

The "general dictionary data Configuration Management" in the framework mainly solves the problem that all industry software provides customers with the first step of basic data maintenance, and a system dictionary is indispensable, the wider the scope of the business involved, the more dictionaries. If every

When the page needs to use more than one drop-down box, the data dictionary combined with the custom label can bring us a lot of convenience. Custom labels can be reused, equivalent to a framework that simplifies our code.Here's a summary of my routines. First, the database tables are as follows:Then there must be a way to query the field, below I have my Code (folding form) attached, for your reference onl

I recently started to learn about oracle and now share my notes as follows. I. Data Dictionary Data dictionary is the most important component of the oracle database. It provides some system information of the database. Such as the height, weight, skin color, and other static information of a person. It is a set of rea

Data dictionary generation tool journey (1): helpful for Generating tools Recently, we found a very low efficiency when doing our company's demand. When creating a table, we need to use our own modeling tools to create a table, copying and pasting a field is unacceptable. So I developed a tool to solve this inefficiency. As the opening part, we will preview the entire overview of the tool! Reading director

the value of key is the set typec['a'].add (1) c['a'].add (2) c['a'].add (2) c['b'].add (4)Print('the value of key is a dictionary of the list type:', D)Print('the value of key is a dictionary of the set type:'C>>> ================================ RESTART ================================>>>the value of key is a dictionary of list type: Defaultdict (class 'List',

1, the definition of the Python dictionary1. Use curly braces {}, separate each key-value pair with a comma, and connect the key to the value with a colon2, Key: Need immutable data structure, the value can be arbitrary data object3, the dictionary is unordered, the key in the dictionary must be unique, in the

Summary:Python basic one data type dictionary, this article mainly speaks the dictionary.1, define Dictionary2, the basic knowledge of the dictionary3, the method of the dictionary1, define Dictionary1, define 1 empty dictionariesDict1 = {}2, define DictionaryDict1 = Dict (x=10,y=10)3, converting the list to a dictionaryDict1 = Dict ([' A ', ' Ten '), (' B ', 10)

1. What is a dictionary?A dictionary is a data structure that refers to a value by its name, which is called a mapping and is the only built-in mapping type in Python.2. Why use a dictionary?A dictionary can easily be traced to its definition (value) by a specific word (key)

ORACLE Data dictionary is an important component. It is generated with the database and changes with the database. It is reflected in some tables and Views under the sys user. The data dictionary name is an uppercase English character. The data

Tags: idle lock session includes RAR AST Oracle Order SSIOracleData Dictionary The Oracle data dictionary is where the data is stored, and its purpose is to describe the data. Data dictionaries can be divided into static and dynam

When doing this function, I searched for a lot of information online and found that this solution was rarely involved. I found related posts. Many people called views for processing. Of course, this problem can be solved by using views. However, if so many tables are used by views, so many views need to be created ........... this is definitely not scientific. In addition, if the view is used, the data entity is inconsistent with the actual table. The

;> list1 = [1,9,3,7,2,6,0]>>> list1.sort()>>> list1[0, 1, 2, 3, 6, 7, 9]>>> list1.sort(reverse=True) >>> list1[9, 7, 6, 3, 2, 1, 0] Len () gets the sequence length>>> len(list1)7 Max () Gets the maximum value of the sequence>>> max(list1)9 Min () Gets the minimum value of the element>>> min(list1)0 List () applies to all types of sequences. Strings cannot be modified like lists, so it is sometimes useful to create lists from strings>>> h = list("hello")>>> h[‘h‘, ‘e‘, ‘l‘, ‘l‘, ‘o‘] Jo