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  • How to Create/Drop Database, Table

    SHOW ALL DATABASES

    SHOW {DATABASES | SCHEMAS}
        [LIKE 'pattern' | WHERE expr]

    SHOW DATABASES lists the databases on the MySQL server host.

    CREATE DATABASE

    CREATE {DATABASE | SCHEMA} [IF NOT EXISTS] db_name
        [create_specification] ...
    
    create_specification:
        [DEFAULT] CHARACTER SET [=] charset_name
      | [DEFAULT] COLLATE [=] collation_name

    CREATE DATABASE creates a database with the given name. To use this statement, you need the CREATE privilege for the database. CREATE SCHEMA is a synonym for CREATE DATABASE.

    DROP DATABASE

    DROP {DATABASE | SCHEMA} [IF EXISTS] db_name

    DROP DATABASE drops all tables in the database and deletes the database. Be very careful with this statement! To use DROP DATABASE, you need the DROP privilege on the database. DROP SCHEMA is a synonym for DROP DATABASE.

    SHOW ALL TABLES

    SHOW [FULL] TABLES [{FROM | IN} db_name]
        [LIKE 'pattern' | WHERE expr]

    SHOW TABLES lists the non-TEMPORARY tables in a given database.

    DROP TABLE

    DROP [TEMPORARY] TABLE [IF EXISTS]
        tbl_name [, tbl_name] ...
        [RESTRICT | CASCADE]

    DROP TABLE removes one or more tables.

    CREATE TABLE

    CREATE [TEMPORARY] TABLE [IF NOT EXISTS] tbl_name
        (create_definition,...)
        [table_options]
        [partition_options]

    Or:

    CREATE [TEMPORARY] TABLE [IF NOT EXISTS] tbl_name
        [(create_definition,...)]
        [table_options]
        [partition_options]
        select_statement

    Or:

    CREATE [TEMPORARY] TABLE [IF NOT EXISTS] tbl_name
        { LIKE old_tbl_name | (LIKE old_tbl_name) }
    create_definition:
        col_name column_definition
      | [CONSTRAINT [symbol]] PRIMARY KEY [index_type] (index_col_name,...)
          [index_option] ...
      | {INDEX|KEY} [index_name] [index_type] (index_col_name,...)
          [index_option] ...
      | [CONSTRAINT [symbol]] UNIQUE [INDEX|KEY]
          [index_name] [index_type] (index_col_name,...)
          [index_option] ...
      | {FULLTEXT|SPATIAL} [INDEX|KEY] [index_name] (index_col_name,...)
          [index_option] ...
      | [CONSTRAINT [symbol]] FOREIGN KEY
          [index_name] (index_col_name,...) reference_definition
      | CHECK (expr)
    
    column_definition:
        data_type [NOT NULL | NULL] [DEFAULT default_value]
          [AUTO_INCREMENT] [UNIQUE [KEY] | [PRIMARY] KEY]
          [COMMENT 'string']
          [COLUMN_FORMAT {FIXED|DYNAMIC|DEFAULT}]
          [reference_definition]
    
    data_type:
        BIT[(length)]
      | TINYINT[(length)] [UNSIGNED] [ZEROFILL]
      | SMALLINT[(length)] [UNSIGNED] [ZEROFILL]
      | MEDIUMINT[(length)] [UNSIGNED] [ZEROFILL]
      | INT[(length)] [UNSIGNED] [ZEROFILL]
      | INTEGER[(length)] [UNSIGNED] [ZEROFILL]
      | BIGINT[(length)] [UNSIGNED] [ZEROFILL]
      | REAL[(length,decimals)] [UNSIGNED] [ZEROFILL]
      | DOUBLE[(length,decimals)] [UNSIGNED] [ZEROFILL]
      | FLOAT[(length,decimals)] [UNSIGNED] [ZEROFILL]
      | DECIMAL[(length[,decimals])] [UNSIGNED] [ZEROFILL]
      | NUMERIC[(length[,decimals])] [UNSIGNED] [ZEROFILL]
      | DATE
      | TIME
      | TIMESTAMP
      | DATETIME
      | YEAR
      | CHAR[(length)]
          [CHARACTER SET charset_name] [COLLATE collation_name]
      | VARCHAR(length)
          [CHARACTER SET charset_name] [COLLATE collation_name]
      | BINARY[(length)]
      | VARBINARY(length)
      | TINYBLOB
      | BLOB
      | MEDIUMBLOB
      | LONGBLOB
      | TINYTEXT [BINARY]
          [CHARACTER SET charset_name] [COLLATE collation_name]
      | TEXT [BINARY]
          [CHARACTER SET charset_name] [COLLATE collation_name]
      | MEDIUMTEXT [BINARY]
          [CHARACTER SET charset_name] [COLLATE collation_name]
      | LONGTEXT [BINARY]
          [CHARACTER SET charset_name] [COLLATE collation_name]
      | ENUM(value1,value2,value3,...)
          [CHARACTER SET charset_name] [COLLATE collation_name]
      | SET(value1,value2,value3,...)
          [CHARACTER SET charset_name] [COLLATE collation_name]
      | spatial_type
    
    index_col_name:
        col_name [(length)] [ASC | DESC]
    
    index_type:
        USING {BTREE | HASH | RTREE}
    
    index_option:
        KEY_BLOCK_SIZE [=] value
      | index_type
      | WITH PARSER parser_name
    
    reference_definition:
        REFERENCES tbl_name (index_col_name,...)
          [MATCH FULL | MATCH PARTIAL | MATCH SIMPLE]
          [ON DELETE reference_option]
          [ON UPDATE reference_option]
    
    reference_option:
        RESTRICT | CASCADE | SET NULL | NO ACTION
    
    table_options:
        table_option [[,] table_option] ...
    
    table_option:
        ENGINE [=] engine_name
      | AUTO_INCREMENT [=] value
      | AVG_ROW_LENGTH [=] value
      | [DEFAULT] CHARACTER SET [=] charset_name
      | CHECKSUM [=] {0 | 1}
      | [DEFAULT] COLLATE [=] collation_name
      | COMMENT [=] 'string'
      | CONNECTION [=] 'connect_string'
      | DATA DIRECTORY [=] 'absolute path to directory'
      | DELAY_KEY_WRITE [=] {0 | 1}
      | INDEX DIRECTORY [=] 'absolute path to directory'
      | INSERT_METHOD [=] { NO | FIRST | LAST }
      | KEY_BLOCK_SIZE [=] value
      | MAX_ROWS [=] value
      | MIN_ROWS [=] value
      | PACK_KEYS [=] {0 | 1 | DEFAULT}
      | PASSWORD [=] 'string'
      | ROW_FORMAT [=] {DEFAULT|DYNAMIC|FIXED|COMPRESSED|REDUNDANT|COMPACT}
      | UNION [=] (tbl_name[,tbl_name]...)
    
    partition_options:
        PARTITION BY
            { [LINEAR] HASH(expr)
            | [LINEAR] KEY(column_list)
            | RANGE{(expr) | COLUMNS(column_list)}
            | LIST{(expr) | COLUMNS(column_list)} }
        [PARTITIONS num]
        [SUBPARTITION BY
            { [LINEAR] HASH(expr)
            | [LINEAR] KEY(column_list) }
          [SUBPARTITIONS num]
        ]
        [(partition_definition [, partition_definition] ...)]
    
    partition_definition:
        PARTITION partition_name
            [VALUES 
                {LESS THAN {(expr | value_list) | MAXVALUE} 
                | 
                IN (value_list | value_list)}]
            [[STORAGE] ENGINE [=] engine_name]
            [COMMENT [=] 'comment_text' ]
            [DATA DIRECTORY [=] 'data_dir']
            [INDEX DIRECTORY [=] 'index_dir']
            [MAX_ROWS [=] max_number_of_rows]
            [MIN_ROWS [=] min_number_of_rows]
            [(subpartition_definition [, subpartition_definition] ...)]
    
    subpartition_definition:
        SUBPARTITION logical_name
            [[STORAGE] ENGINE [=] engine_name]
            [COMMENT [=] 'comment_text' ]
            [DATA DIRECTORY [=] 'data_dir']
            [INDEX DIRECTORY [=] 'index_dir']
            [MAX_ROWS [=] max_number_of_rows]
            [MIN_ROWS [=] min_number_of_rows]
    
    select_statement:
        [IGNORE | REPLACE] [AS] SELECT ...   (Some legal select statement)

    CREATE TABLE creates a table with the given name. You must have the CREATE privilege for the table.

    for example:

    CREATE TABLE account

    (

    user_Name char(15) not null,

    user_Password char(15) not null

    );

    INSERT INTO account VALUES

    (‘xiang’, ‘123456’);

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  • 原文地址:https://www.cnblogs.com/johnpher/p/2878879.html
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