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  • MySQL使用指南 PDF 下载

    MySQL使用指南 PDF 下载

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    主要内容:
    Internals and Portability
    • Written in C and C++.
    • Tested with a broad range of different compilers.
    • Works on many different platforms. See https://www.mysql.com/support/supportedplatforms/
    database.html. • For portability, configured using CMake. • Tested with Purify (a commercial memory leakage detector) as well as with Valgrind, a GPL tool
    (http://developer.kde.org/~sewardj/).
    • Uses multi-layered server design with independent modules.
    • Designed to be fully multithreaded using kernel threads, to easily use multiple CPUs if they are
    available.
    • Provides transactional and nontransactional storage engines.
    • Uses very fast B-tree disk tables (MyISAM) with index compression.
    • Designed to make it relatively easy to add other storage engines. This is useful if you want to provide
    an SQL interface for an in-house database.
    • Uses a very fast thread-based memory allocation system.
    • Executes very fast joins using an optimized nested-loop join.
    • Implements in-memory hash tables, which are used as temporary tables.
    • Implements SQL functions using a highly optimized class library that should be as fast as possible.
    Usually there is no memory allocation at all after query initialization.
    • Provides the server as a separate program for use in a client/server networked environment, and as
    a library that can be embedded (linked) into standalone applications. Such applications can be used
    in isolation or in environments where no network is available.
    Data Types
    • Many data types: signed/unsigned integers 1, 2, 3, 4, and 8 bytes long, FLOAT, DOUBLE, CHAR,
    VARCHAR, BINARY, VARBINARY, TEXT, BLOB, DATE, TIME, DATETIME, TIMESTAMP, YEAR, SET,
    ENUM, and OpenGIS spatial types. See Chapter 11, Data Types. • Fixed-length and variable-length string types.
    Statements and Functions
    • Full operator and function support in the SELECT list and WHERE clause of queries. For example:
    mysql> SELECT CONCAT(first_name, ‘ ‘, last_name)
     -> FROM citizen
     -> WHERE income/dependents > 10000 AND age > 30;
    • Full support for SQL GROUP BY and ORDER BY clauses. Support for group functions (COUNT(),
    AVG(), STD(), SUM(), MAX(), MIN(), and GROUP_CONCAT()).
    6
    The Main Features of MySQL
    • Support for LEFT OUTER JOIN and RIGHT OUTER JOIN with both standard SQL and ODBC
    syntax.
    • Support for aliases on tables and columns as required by standard SQL.
    • Support for DELETE, INSERT, REPLACE, and UPDATE to return the number of rows that were
    changed (affected), or to return the number of rows matched instead by setting a flag when
    connecting to the server.
    • Support for MySQL-specific SHOW statements that retrieve information about databases, storage
    engines, tables, and indexes. Support for the INFORMATION_SCHEMA database, implemented
    according to standard SQL.
    • An EXPLAIN statement to show how the optimizer resolves a query.
    • Independence of function names from table or column names. For example, ABS is a valid column
    name. The only restriction is that for a function call, no spaces are permitted between the function
    name and the “(” that follows it. See Section 9.3, “Keywords and Reserved Words”. • You can refer to tables from different databases in the same statement.
    Security

     

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