{"id":222,"date":"2017-12-10T08:56:52","date_gmt":"2017-12-10T08:56:52","guid":{"rendered":"https:\/\/blinksql.com\/?p=222"},"modified":"2017-12-10T08:56:52","modified_gmt":"2017-12-10T08:56:52","slug":"basic-commands-in-mysql","status":"publish","type":"post","link":"https:\/\/blinksql.com\/?p=222","title":{"rendered":"Basic Commands in Mysql"},"content":{"rendered":"

->\u00a0This is the world’s second most popular and widely used open source database.<\/p>\n

-> All the database names, table names and table fields name are case sensitive.<\/p>\n

-> To switch from one database to another database<\/p>\n

cmd:USE\u00a0database_name;\u00a0\u00a0<\/strong><\/p>\n

-> To list all the databases<\/p>\n

cmd: show databases;<\/strong><\/p>\n

-> To see the tables<\/p>\n

cmd: show tables;<\/strong><\/p>\n

-> To select the first record<\/p>\n

cmd:SELECT<\/span>\u00a0column_name\u00a0\u00a0FROM<\/span>\u00a0table_name LIMIT\u00a01;\u00a0\u00a0<\/strong><\/p>\n

Mysql_connect:<\/strong><\/p>\n

Every time you need to open and close database connection, depending on the request.<\/p>\n

Mysql_pconnect:<\/strong><\/p>\n

It opens a persistent connection to the database that can not be closed.<\/p>\n

\u00a0i_am_a_dummy flag:<\/p>\n

It enables MySQL engine to refuse any UPDATE or DELETE statement to execute if the WHERE clause is not present.<\/p>\n

To find Nth highest salary is:<\/strong><\/p>\n

\u00a0cmd:select<\/span>\u00a0distinct<\/span>(salary)\u00a0from<\/span>\u00a0employee\u00a0order<\/span>\u00a0by<\/span>\u00a0salary\u00a0desc<\/span>\u00a0limit\u00a0n-1,1\u00a0\u00a0<\/strong><\/p>\n

Default Port of Mysql:<\/strong><\/div>\n
The default port of MySQL Server is 3306.<\/div>\n
<\/div>\n
\n

To retrieve a hundred books starting from 20th:<\/p>\n

SELECT book_title FROM books LIMIT 20, 100;<\/p>\n<\/div>\n

<\/div>\n
DataDirectory:<\/strong><\/div>\n
The default location of MySQL data directory in windows is C:\\mysql\\data or C:\\Program Files\\MySQL\\MySQL Server 5.0 \\data.<\/div>\n
<\/div>\n
<\/div>\n
<\/div>\n
<\/div>\n
<\/div>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

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