Bt0075, rdbms and my sql
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![mysql> create table testalter_tbl
-> (
-> i INT,
-> c CHAR(1)
-> );
Query OK, 0 rows affected (0.05 sec)
mysql> SHOW COLUMNS FROM testalter_tbl;
+-------+---------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------+---------+------+-----+---------+-------+
| i | int(11) | YES | | NULL | |
| c | char(1) | YES | | NULL | |
+-------+---------+------+-----+---------+-------+
2 rows in set (0.00 sec)
Dropping, Addingor Repositioninga Column:
Suppose we want to drop an existing column i from above MySQL table then you will use DROP clause
alongwithALTER commandas follows:
3 Explainupdate and replace statementswith examples.
Answer:InSQL, a viewisa virtual table basedonthe result-setof anSQL statement.
A view contains rows and columns, just like a real table. The fields in a view are fields from one or more
real tablesinthe database.
We cab add SQL functions, WHERE, and JOIN statements to a view and present the data as if the data
were comingfromone single table.
SQL CREATE VIEW Syntax:
CREATE VIEW view_name AS
SELECT column_name(s)
FROMtable_name
4 Explainthe date and time functions indetail.
Answer: Defines a time of a day without time zone awareness and is based on a 24-hour clock. Click here
to readmore frommsdn.
Syntax: - time [ (fractional second precision) ]
Where 'fractional seconds precision' specifies the number of digits for the fractional part of the seconds.
itsdefaultby7 andcan be from0 to 7.
5 Define grant tables. Describe the steps to set up MySQL user accounts. Also explain the method to
assign passwords to the anonymousaccounts.
Answer: One of the most powerful aspects of the MySQL server is the amazing amount of control the
administrator has over each user’s intended behavior. This control can restrict user privileges over a](https://image.slidesharecdn.com/bt0075rdbmsandmysql-150825083809-lva1-app6892/85/Bt0075-rdbms-and-my-sql-2-320.jpg)
Bt0075, rdbms and my sql
- 1. Dear students get fully solved assignments Send your semester & Specialization name to our mail id : “ help.mbaassignments@gmail.com ” or Call us at : 08263069601 SUMMER 2015 , ASSIGNMENT PROGRAM BSc IT SEMESTER 3 SUBJECT CODE & NAME BT0075, RDBMS and MySQL CREDIT 4 BK ID B1003 MAX.MARKS 60 Note: Answer all questions. Kindly note that answers for 10 marks questions should be approximately of 400 words. Each questionis followedbyevaluationscheme. 1 Explainthe blob,text and enum data types. Answer: Properly defining the fields in a table is important to the overall optimization of your database. You should use only the type and size of field you really need to use; don't define a field as 10 characters wide if you know you're only going to use 2 characters. These types of fields (or columns) are also referredtoas data types,afterthe type of data youwill be storinginthose fields. MySQL uses many different data types broken into three categories: numeric, date and time, and string types. Date and Time Types: The MySQL date and time datatypes are: 2 How to alter databases and tables?Explainwith the helpof examples. Answer: MySQL ALTER command is very useful when you want to change a name of your table, any table fieldorif youwant to add or delete anexistingcolumninatable. Let's beginwithcreationof atable calledtestalter_tbl. root@host# mysql -u root -p password; Enter password:******* mysql> use TUTORIALS; Database changed
- 2. mysql> create table testalter_tbl -> ( -> i INT, -> c CHAR(1) -> ); Query OK, 0 rows affected (0.05 sec) mysql> SHOW COLUMNS FROM testalter_tbl; +-------+---------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +-------+---------+------+-----+---------+-------+ | i | int(11) | YES | | NULL | | | c | char(1) | YES | | NULL | | +-------+---------+------+-----+---------+-------+ 2 rows in set (0.00 sec) Dropping, Addingor Repositioninga Column: Suppose we want to drop an existing column i from above MySQL table then you will use DROP clause alongwithALTER commandas follows: 3 Explainupdate and replace statementswith examples. Answer:InSQL, a viewisa virtual table basedonthe result-setof anSQL statement. A view contains rows and columns, just like a real table. The fields in a view are fields from one or more real tablesinthe database. We cab add SQL functions, WHERE, and JOIN statements to a view and present the data as if the data were comingfromone single table. SQL CREATE VIEW Syntax: CREATE VIEW view_name AS SELECT column_name(s) FROMtable_name 4 Explainthe date and time functions indetail. Answer: Defines a time of a day without time zone awareness and is based on a 24-hour clock. Click here to readmore frommsdn. Syntax: - time [ (fractional second precision) ] Where 'fractional seconds precision' specifies the number of digits for the fractional part of the seconds. itsdefaultby7 andcan be from0 to 7. 5 Define grant tables. Describe the steps to set up MySQL user accounts. Also explain the method to assign passwords to the anonymousaccounts. Answer: One of the most powerful aspects of the MySQL server is the amazing amount of control the administrator has over each user’s intended behavior. This control can restrict user privileges over a
- 3. general part of the server, such as limited access to an entire database, but can also be as specific as limitingprivileges foraspecifictable orevencolumn. One of the mostpowerful aspectsof the 6 Brieflydescribe the error log and general query log. Answer: If you are a web developer, you need to refer to various log files, in order to debug your application or improve its performance. Logs is the best place to start troubleshooting. Concerning the famousMySQL database server(orMariaDB server),youneedtorefertothe followinglogfiles: The Error Log. It contains information about errors that occur while the server is running (also serverstart andstop) The General Query Log. This is a general record of what mysqld is doing (connect, disconnect, queries) Dear students get fully solved assignments Send your semester & Specialization name to our mail id : “ help.mbaassignments@gmail.com ” or Call us at : 08263069601