Change column datatype in mysql

                       You created a table with column in specific datatype. Sometimes you need to change datatype of column. At the time, you can modify the datatype of field. It is possible in mysql. The following mysql query is used for this:

Mysql Query:

                         Alter table table_name modify column_name datatype(length)

Consider the example:
 table1 is name of this table.

When you click the structure of table in your database, it is look like this:

                          Suppose you've to change datatype of column 'Game_name'. On that time you can change the field type. The mysql query is:

                     Alter table table1 modify Game_name char(15)

Now your structure look like this:

     Now your Game_name column type is changed from varchar into char.

Changing the multiple column datatype at the time in mysql:

                      You can change multiple column datatype at a time in mysql. The mysql query as follow as:

Mysql Query:

                          Alter table table1
                                    modify No varchar(5),

                                    modify Game_name char(15),

                                    modify Image char(15)

                          Now your output look like this:

                          Now you will get output column 'No' with varchar, 'Game_name' with char and 'Image' with char in your mysql table.

Datatypes in mysql:

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Move columns in mysql table

                       You can change the column name and change the column size in mysql. But can you rearrange the column order in mysql table. Yes, you can rearrange it in mysql. It can be done by 'ALTER', 'CHANGE' and 'AFTER' mysql command. The mysql query for move the column in mysql table is:

                   " ALTER TABLE table_name CHANGE column_name column_name datatype(length) AFTER column_name"

                       You can also done by 'MODIFY' mysql command. The mysql query as follows as:

                   " ALTER TABLE table_name MODIFY column_name datatype(length) AFTER column_name"

Consider the following example: table1 is the name of table.

                   

                       Now the column 'name' is moved after column 'img'. The mysql query as follows as:

                   " ALTER TABLE table1 CHANGE name name varchar(30) AFTER img"

Now you'll get output like this:

The column name 'name' is placed after 'img' in mysql table 'table1'.

Move  multiple columns at the time in mysql:

                             You can move multiple columns at the time in mysql. The column name order id, name ,img in table1 is changed into img, name ,id. The mysql query as follows as:

                         "ALTER TABLE table1 CHANGE id id int(5) AFTER img,

                                         CHANGE name name varchar(30) AFTER img"

Now you'll get output like this:

Now the order of table1 is changed like above output.

Related Post:

Change column name in mysql
Change column size in mysql table
Delete column in mysql table
Add column after specific field in mysql table
Change column datatype in mysql
Change table name in mysql
Change column NOT NULL to NULL in mysql
Add primary key to existing column in mysql
how to add auto increment to existing column in mysql
How to remove auto increment from column in mysql

Changing the column size in mysql

                       You created a table with specific size of column. Sometimes you need to increase the size of column, if the size is not enough. At the time, you can modify the size of field. It is possible in mysql. The following mysql query is used for this:

Mysql Query:

                         Alter table table_name modify column_name datatype(length)

Consider the example:
 table1 is name of this table.

When you click the structure of table in your database. It is look like this:

                          Suppose you've to add more characters to column Game_name. On that time you can change the field size. The mysql query is:
                     Alter table table1 modify Game_name varchar(40)  

Now your structure look like this:

     Now your Game_name column size is changed into 40.

Changing the multiple column size at the time in mysql:

                      You can change multiple column size at a time in mysql. The mysql query as follow as:

Mysql Query:

                          Alter table table1

                                    modify Game_name varchar(50),

                                    modify Image varchar(40)

                          Now your output look like this:

                          Now you will get output as Game_name with 50 size and Image with 40 size.

Related Post:

Add column after specific field in mysql table
Delete column in mysql table
Change column name in mysql
Change column datatype in mysql
Change column NOT NULL to NULL in mysql
Add primary key to existing column in mysql
how to add auto increment to existing column in mysql
How to remove auto increment from column in mysql

Changing column name in mysql table

                       You created a table with specific column name. Sometimes you need to change the column name. At the time, you can change the field name. It is possible in mysql using by CHANGE mysql command. The following mysql query is used for this:

Mysql Query:

                         Alter table table_name change old_column_name  new_column_name datatype(length)

Consider the example:
 table1 is name of this table.

                          Suppose you've to change the column name. The mysql query is:

                     Alter table table1 change Game_name  name varchar(40)

Now your table look like this:

     Now the column name 'Game_name' is changed into 'name'.

Changing the multiple column name at the time in mysql:

                      You can change multiple column name at a time in mysql. The mysql query as follow as:

Mysql Query:

                          Alter table table1

                                    change No id int(5),

                                    modify Image img varchar(40)

                          Now your output look like this:

                          Now you will get output as No to id and Image to img.

Related Post:

Add column after specific field in mysql table
Delete column in mysql table
Change column size in mysql table
Change column datatype in mysql
Change table name in mysql
Change column NOT NULL to NULL in mysql
Add primary key to existing column in mysql
how to add auto increment to existing column in mysql
How to remove auto increment from column in mysql

Delete column in mysql table

                       You created a table with number of columns. Sometimes you don't need to specific column. At the time, you can delete the column from mysql table. It is possible in mysql using by DROP mysql command. The following mysql query is used for this:

Mysql Query:

                         Alter table table_name drop column column_name

Consider the example:
 table1 is name of this table.

                          Suppose you've to delete the column 'Image'. The mysql query is:

                     Alter table table1 drop column Image

Now your table look like this:

     Now the column name 'Image' is deleted from your mysql table.

Deleting the multiple column at the time in mysql:

                      You can delete multiple column at a time in mysql. The mysql query as follow as:

Mysql Query:

                          Alter table table1

                                    drop column Game_name,

                                    drop column Image

                          Now your output look like this:

                          Now you will get your mysql table with only column 'No'.

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Add column after specific field in mysql 
Change column name in mysql
Change column size in mysql table
Change column size in mysql table
Change column datatype in mysql
Change table name in mysql
Change column NOT NULL to NULL in mysql
Add primary key to existing column in mysql
how to add auto increment to existing column in mysql
How to remove auto increment from column in mysql

Add column after specific field in mysql

                       When you try to add add new column to your table, by default the column should be added to end of your table. But you can add it wherever you want in a table. It is possible in mysql.

Myql Query:

                     alter table tablename add column columnname datatype(length) AFTER specific field name

Add column after particular field in mysql:

               
                    Consider a example. Table1 is name of table. Normally the table look this this:

Now you are going to add column after specific column. The mysql query is:
     alter table Table1 add column Game_Tag varchar(30)  AFTER Game_Name

The output look like this:

Now you will get column 'Game_Tag' is after 'Game_Name'.

Add column at first in mysql:

              Now you are going to add column before specific field. The mysql query is:

    alter table Table1 add column Game_Tag varchar(30) FIRST

The output look like this:

Now you'll get output as column 'Game_Tag' is present first of your table.

Add multiple columns after specific field in mysql:

               You can add multiple columns after particular column in mysql. The mysql query is:

     alter table Table1

        add column Game_Tag varchar(30),

        add column count int(10),

        add column category varchar(30)

              AFTER Image

The output look like this:

Now you added three columns after column 'Image'.

Related Post:

Change column name in mysql
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Change column size in mysql table
Change column datatype in mysql
Change table name in mysql
Change column NOT NULL to NULL in mysql
Add primary key to existing column in mysql
how to add auto increment to existing column in mysql
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Copy values from one database to another in mysql

                       All of you know, you can copy data within a table and between tables. But can you copy data between two database in mysql. Yes, you can done it in mysql. The following mysql query is used for do this.

Mysql Query:

                         INSERT INTO database2.table_name (column_name)

                              SELECT table_name.column_name FROM table_name

Copy data from one database to another in mysql:

                       Consider following example. You've two databases named with db1 and db2. Each database have a table. Table1 is presented in db1 and Table2 is present in db2.

The Table1 in db1 is look like this:

The Table2 in db2 look like this:

Now we copy data from database db1 to db2. The mysql query is:

                     
                     INSERT INTO db2.Table2(name,image)

                              SELECT Table1.name, Table2.name FROM Table1

Now you will get output as follow as:

                   Now you'll get values in Table2 as like as Table1 in db.

Copy data from one database to another with specific condition in mysql:

                  You can copy only specific values from one database to another in mysql using 'WHERE' condition in mysql. Consider a example: Now we are going to copy named with 'sample1' and 'sample2' from database db1. The mysql query is:

                     INSERT INTO db2.Table2(name,image)

                              SELECT Table1.name, Table2.name FROM Table1
                              WHERE Game_name!='sample3'

Now you'll get output as follow as:

Note:

          You can copy the values from one database to another using  this method only if two databases are in same server.

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Copy values from one column to another within table in mysql
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Copy values from one column to another within table in mysql

                      Mostly we had copied only particular values from one table to another. Similarly we had copied only particular values within a table. Now the question is rise. That is, can copy the whole column values to another column in same table? Is it possible in mysql?. Yes it is possible in mysql. We can copy the all values in one column to another within a table.
                     Consider a following example:
                                   Table1 is a table name.
                                               

                   
 Now you need to add another column with named as 'Author'. The mysql query is:
                     Alter table Table add column Author varchar(30)

                     You need to copy the Game_Name column values to Author column. The mysql query as follows as:
                              
                               Update tablename set column2=column1

That means, Update Table1 set Author=Game_Name.

Now You will get following as a output:

          

                             Now you will get the output both the Game_name and Author column values are same.

Copy values from one column to another except some values within table:

                           Suppose you have to copy all values in a column except some value to another column within a table. It can be done by following mysql query:

                           Update Table1 set Game_Name=Author where Game_Name!='sample1'

Your output look like this:

Now you'll get all values from one column to another except some value.

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Copy values from one table to another in mysql

                       We can easily copy the values within a table. But can we copy the values from one table to another table?. Yes, you can done it in mysql. The mysql query is:

                       Insert into table2 (column_name1, column_name2) 
                               select column_name1, column_name2 from table1

Consider the example:
 Table1 is name of this table.

Table2 is name of this table.

Copy values from one table1 to table2 in mysql:

                         Now you have to add values from 'Table1' to 'Table2'. The following mysql query is used to do it.
                         Insert into Table2 (No,Game_name,Image)
                              select No,Game_Name, Image from Table1

The output of  'Table2' is:

Now you'll get values in 'Table2' which is same as 'Table1'.

Copy values from one table to another except some values in mysql:

                        If you want to some coulmn values, then you will add only required column name only in mysql query. Suppose you need only particular values. Then you use 'where' clause to get your answer. The mysql query as follow as:

                        

                        Insert into Table2 (No,Game_name,Image)

                              select No,Game_Name, Image from Table1  

                                where  Game_Name='sample1' and Game_Name='sample2'

Then the output look like this:

Now you will get values only named in sample1 and sample2.

Related Post:

Copy values from one column to another within table in mysql
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Create mysql database in cpanel

                       1.You have to login to your cpanel to create mysql database.
                       2.Then you need to select mysql databases.

                       3.Type your database name. Then click create database button. Here, my database name is 'new'.

Now you'll get successful message as created database successfully as follows as:

                   
                          4.Then you have to create new user. Type your user name here.

Then click password generator to get password for your user name in mysql. The pop up box is opened as follows as.

Select the checked box and click use password button. Then you the strength password is loaded. Then click create user button.

Now the user name is created.
                   5. Then you need to add your user name to mysql database. Select your user name and database as follows as. then click Add button.

                  6. Now you select all the privileges. Then click Make changes button.

                     7. Finally you will get a message like this:

Now you created a mysql database , user in cpanel and add user to mysql database. Then you back to home and click phpmyadmin.

Then you can create table in your mysql database.

Robots.txt

                        Robots.txt is a text file which is used to instruct the search engines for how to crawl and index the pages on your site. The search engines should be obey the robots.txt. The search engine follow the instruction specified by robots.txt file. If you want to some of your pages are not crawl by search engine, then you can protect that pages in robots.txt. Then the search engine don't crawl particular pages specified by your robots.txt file.

                       The search engine comes to your robots.txt file before it crawl to your pages. It must be placed in your main directory. Otherwise, it can not able to find robots.txt file in your server.

Syntax:
                User-agent: *
                Allow: /

                where,
                           User-agent represents the search engines.
                           Allow means the robots.txt file allow the all search engines to crawl all of your contents.

Disallow the all crawlers by robots.txt:

                User-agent: *
                Disallow:  /

                               

                           Now, the search engine don't crawl and index your pages.

Disallow the particular folder by robots.txt:

                User-agent: *
                Disallow:  /cgi-bin/
                Disallow:  /images/

                 You need a separate disallow for each folder. Now the search engine don't index your images folder.

Disallow the particular file in a folder by robots.txt:

                User-agent: *
                Disallow:  /sample/example.php

                           Now, the search engine don't index example.php file in sample folder.

Robots meta tags by robots.txt:

                               It control the individual pages present in search result. It should be present within head tag.
For example,
                    <meta name="robots" content="noindex">
                       The above line instructs the search engine to don't show this page in search result. 
                       

Disallow the particular search engine by robots.txt:

              If you want to restrict particular search engines don't index your pages, then you can use robots.txt to restrict it.

Syntax:
              User-agent: Googlebot
              Disallow: / 

                  Now all the search engines index your pages except google. Googlebot is the search engine of google.

See also:
                .htaccess