How to Create/Drop Database, Table

SHOW ALL DATABASES

SHOW {DATABASES | SCHEMAS}
    [LIKE '[code]pattern

' | WHERE

expr

][/code]

SHOW DATABASES

lists the databases on the MySQL server host.

CREATE DATABASE

CREATE {DATABASE | SCHEMA} [IF NOT EXISTS] [code]db_name

[

create_specification

] ...

create_specification

:
[DEFAULT] CHARACTER SET [=]

charset_name

| [DEFAULT] COLLATE [=]

collation_name

[/code]

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] [code]db_name

[/code]

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} [code]db_name

]
[LIKE '

pattern

' | WHERE

expr

][/code]

SHOW TABLES

lists the non-

TEMPORARY

tables in a given database.
DROP TABLE

DROP [TEMPORARY] TABLE [IF EXISTS]
    [code]tbl_name

[,

tbl_name

] ...
[RESTRICT | CASCADE][/code]

DROP TABLE

removes one or more tables.

CREATE TABLE

CREATE [TEMPORARY] TABLE [IF NOT EXISTS] [code]tbl_name

(

create_definition

,...)
[

table_options

]
[

partition_options

][/code] Or:

CREATE [TEMPORARY] TABLE [IF NOT EXISTS] [code]tbl_name

[(

create_definition

,...)]
[

table_options

]
[

partition_options

]

select_statement

[/code] Or:

CREATE [TEMPORARY] TABLE [IF NOT EXISTS] [code]tbl_name

{ LIKE

old_tbl_name

| (LIKE

old_tbl_name

) }[/code]

[code]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

| ***G_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

)[/code]

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’);