mysql视图、存储过程、函数、索引全解析

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创建视图:

-格式:CREATE VIEW 视图名称 AS  SQL语句

CREATE VIEW v1 AS

SELET nid,

    name

FROM

    A

WHERE

nid > 4

删除视图:

--格式:DROP VIEW 视图名称

DROP VIEW v1

修改视图:

- 格式:ALTER VIEW 视图名称 AS SQL语句

ALTER VIEW v1 AS

SELET A.nid,

    B. NAME

FROM

    A

LEFT JOIN B ON A.id = B.nid

LEFT JOIN C ON A.id = C.nid

WHERE

    A.id > 2

AND C.nid < 5


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