摘要：增增加一張表增加記錄增加字段增加索引主鍵唯一索引普通索引全文索引刪逐行刪除清空整張表刪除表刪除字段刪除索引改變更數(shù)據(jù)變更字段變更變更字段值為另一張表的某個值查普通查詢關(guān)聯(lián)查詢合計函數(shù)條件查詢關(guān)鍵字無法與合計函數(shù)一起使用同一個實(shí)例下跨庫查詢復(fù)

增加一張表

CREATE TABLE `table_name`(
  ...
  )ENGINE=InnoDB DEFAULT CHARSET=utf8;

增加記錄

INSERT INTO `your_table_name`(`column_name`)
VALUES
("your_value_one"),
("your_value_two");

增加字段

ALTER TABLE `your_table_name`
ADD `your_column_name` ...
AFTER `column_name`;

增加索引

主鍵

ALTER TABLE `your_table_name`
ADD PRIMARY KEY your_index_name(your_column_name);

唯一索引

ALTER TABLE `your_table_name`
ADD UNIQUE your_index_name(your_column_name);

普通索引

ALTER TABLE `your_table_name`
ADD INDEX your_index_name(your_column_name);

全文索引

ALTER TABLE `your_table_name`
ADD FULLTEXT your_index_name(your_column_name);

逐行刪除

DELETE FORM `table_name`
WHERE ...;

清空整張表

TRUNCATE TABLE `your_table_name`;

刪除表

DROP TABLE `your_table_name`;

刪除字段

ALTER TABLE `your_table_name`
DROP `column_name`;

刪除索引

ALTER TABLE `your_table_name`
DROP INDEX your_index_name(your_column_name);

變更數(shù)據(jù)

UPDATE `table_name`
SET column_name=your_value
WHERE ...;

變更字段

ALTER TABLE `your_table_name`
CHANGE `your_column_name` `your_column_name` ...(變更);

變更字段值為另一張表的某個值

UPDATE `your_table_name`
AS a
JOIN `your_another_table_name`
AS b
SET a.column = b.another_column
WHERE a.id = b.a_id...;

普通查詢

SELECT `column_name_one`, `column_name_two`
FROM `table_name`;

關(guān)聯(lián)查詢

SELECT *
FROM `your_table_name`
AS a
JOIN `your_anther_table_name`
AS b
WHERE a.column_name = b.column_name...;

合計函數(shù)條件查詢：WHERE 關(guān)鍵字無法與合計函數(shù)一起使用

SELECT aggregate_function(column_name)
FROM your_table_name
GROUP BY column_name
HAVING aggregate_function(column_name)...;

同一個實(shí)例下跨庫查詢

SELECT *
FROM database_name.your_table_name
AS a
JOIN anther_database_name.your_anther_table_name
AS b
WHERE a.column_name = b.column_name...;

CREATE `your_table_name`
LIKE `destination_table_name`;

CREATE `your_table_name`
LIKE `destination_table_name`;

INSERT INTO `your_table_name`
SELECT *
FROM `destination_table_name`;

登陸： mysql -h host -u username -p

列出數(shù)據(jù)庫：SHOW DATABESES;

列出表：SHOW TABLES;

表結(jié)構(gòu)：DESC table_name;

使用一個數(shù)據(jù)庫：USE database_name;

導(dǎo)入：source "file";

導(dǎo)出：mysqldump -h 127.0.0.1 -u root -p "database_name" "table_name" --where="condition" > file_name.sql;

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