Database Management Exam > Database Management Videos > Microsoft SQL for Beginners > SQL Tutorial - 7: Data-Types in SQL (Part-2)
SQL Tutorial - 7: Data-Types in SQL (Part-2) Video Lecture | Microsoft SQL for Beginners - Database Management
FAQs on SQL Tutorial - 7: Data-Types in SQL (Part-2) Video Lecture - Microsoft SQL for Beginners - Database Management
| 1. What are the different data types available in SQL? |  |
Ans. In SQL, there are several data types available, including:
- Numeric data types: These include integer, decimal, and floating-point numbers.
- Character data types: These include char and varchar, which store alphanumeric characters.
- Date and time data types: These include date, time, and timestamp, which store date and time values.
- Boolean data type: This data type stores true or false values.
- Binary data types: These include binary and varbinary, which store binary data such as images or files.
| 2. How do data types affect storage and performance in SQL? | |
Ans. Data types in SQL can affect storage and performance in several ways:
- Storage space: Different data types require different amounts of storage space. For example, an integer data type requires less storage space compared to a decimal data type.
- Indexing: The choice of data type can impact the efficiency of indexing. Certain data types, such as integers, are typically more efficient for indexing compared to character data types.
- Memory usage: Data types can also affect the amount of memory used by the database server. Larger data types may require more memory, leading to increased resource usage.
- Query performance: The choice of data types can impact query performance. For example, using appropriate data types can help optimize join operations and improve overall query execution time.
| 3. Can data types be changed for existing columns in SQL? | |
Ans. Yes, data types can be changed for existing columns in SQL. However, this process may require some precautions and considerations. Some databases provide ALTER TABLE statements that allow you to modify the data type of a column. However, changing the data type of a column may result in data loss or truncation if the new data type cannot accommodate the existing data. It is important to carefully plan and execute such changes, taking backups and testing thoroughly to avoid any potential issues.
| 4. How does the choice of data types impact data integrity in SQL? | |
Ans. The choice of data types in SQL can impact data integrity. By selecting appropriate data types, you can enforce constraints and validations on the data, ensuring its integrity. For example, using a numeric data type for a column that should only store positive integers can prevent the entry of negative values or non-numeric characters. Similarly, using a date data type for a column that should store dates can prevent the insertion of invalid date formats. By choosing the right data types, you can enhance the accuracy and reliability of your data.
| 5. Are there any limitations or considerations when using specific data types in SQL? | |
Ans. Yes, there are certain limitations and considerations when using specific data types in SQL. Some data types may have a limited range or precision, which may impact the storage and manipulation of data. For example, using a float data type for financial calculations may result in rounding errors due to limited precision. Additionally, some data types may have restrictions on the maximum length or size of data that can be stored. It is important to understand these limitations and choose the appropriate data types based on the requirements of your data and application.
Text Transcript from Video
hello guys welcome to my channel this is
the seventh tutorial in this course and
in this tutorial we are going to
continue our discussion on data types
and we're going to check out some of the
options that are available to us in SQL
and in this tutorial we're just going to
see the options that are available to us
and we're not going to you know create
tables and we're not going to insert
data into tables and you know check out
the differences between data types we're
just going to see what is installed and
in the coming tutorials we're going to
you know do all that so it's going to
get easier for us to understand the
differences between data types and the
advantage is that you know some data
types all over the other so firstly we
are going to talk about the options that
we have for storing numbers in our
tables so you've got the big int data
type that you use to store really really
really really really large numbers and
you know then you've got the int data
type that you use to store reasonably
large numbers but not really large
numbers and I haven't included ranges
for both these data types because I
don't want to overwhelm you guys with
the numbers and ranges it's not
important for you to you know memorize
the actual ranges you just need to know
that if you're dealing with the you know
extremely large humongous values and you
use the big in there a type otherwise
for all practical purposes you can use
the int data type you've got the small
in data type in which you store values
that are between minus 32,768 and 30
2007 and 67 so if you sure that the
values are you going to store in you
know in in the field are going to be
between these two numbers and you can
use the small end data type otherwise if
you created a table that is going to
hold ten rows and you know that for nine
rows the value for the field is going to
be between the range that you see on the
screen and for one row the value is
going to be outside this range then it
would make sense for you to declare the
field as int instead of small int right
so it's it's always better to plan in
advance and sort of know you know what
values you might have to store in your
database you know at a future instants
of time and then you've got the tiny end
data type option in which you only store
or positive values between 0 and 255
then you've got the decimal and the
numeric data types right and these are
used to store fractional values and for
both these data types you have to
mention you know two things as arguments
so the first thing that you have to
mention is the size of the you know
value and by that I mean the display
length so if suppose you're storing 57.6
for the value of M or the display length
would be 4 because 57.6 4 in total has
got four digits right and then the value
for D which is the number of digits that
you have after the decimal point would
be 2 because we just have point six four
so you know six four makes two digits
and then you've got the float data type
and with float it's not necessary for
you to mention M or D as arguments in
that case it takes default values and
we're going to talk about default values
later on and for now just know that
these are the three options that you
have and then we have the day and time
data types so the first one for the
first one that we're gonna check out is
a date/time data type and with this
error type you store values in the
format that you see on screen so if
suppose you're storing 20th August 2013
11:42 p.m. and 15 seconds you know in a
field that has the date/time data type
then you'll first put in the ear number
which is 2 0 1 3 then you will put in 0
8 as you know values for mmm
because August is the 8th month of the
year and then for day you're going to
put 20 because it's 20th of August we're
talking about and then you have to
mention the time in the 24 hour format
so 11:42 p.m. is what 23 42 and then 15
seconds that would make you know 1 5 4 s
NS and then you've got the date type
which is pretty much like the date/time
datatype you know just - the time part
and you've got the time data type which
is just the same as daytime data type -
the date part and then you've also got
the ER data type which is like really
sweet and short and this one holds
only your values so you know if you're
going to put your values like 2005 and
2013 so you know you have you can use
the stereotype and then we've got three
options for characters too so the first
one that we're gonna check out is the ki
data type and with care you have to
specify the upper limit for for the
field right so if suppose you've
mentioned 60 as the upper limit then you
cannot store values that have more than
60 characters in the field and at the
same time you should know that care is a
fixed length they're a type and what I
mean by that is that you know no matter
how many characters you actually store
in the field the memory that would be
used to store those values would be the
same as the memory that's required to
store 60 characters right and for most
database systems that would be 60 bytes
so 60 bytes of memory would be occupied
even if you're storing just 10
characters or five characters if you're
just typing in hi or hello or something
like that you know you're using two or
five characters but the memory that
would be utilized would be of 60
characters so you're wasting memory and
with valkyr data type which is you know
variable and data type you sort of get
an advantage because you know if you're
using five then you're using memory only
for five so you're saving you know
memory space for 55 characters so you
know that's that's really an advantage
and then you've got the text error type
which is used to store large amounts of
data like blog entries or about me
descriptions and you know stuff like
that
and then you've also got the be lob or
the binary large object data type and
this one you use to store images or you
know short video files and those kind of
things so there are lots of other
options that we have available in SQL
and you know I've just discussed a few
that we're going to deal with in the
coming tutorials so I just want you guys
to be a little familiar with the
you know with the terms at least right
so if I type in blob somewhere or if I
type in jar or vodka then you know you
should know that we are talking about
you know binary there are types and
character datatypes respectively so
thank you so much for watching this
tutorial in the coming tutorials I
assure you that all of this is going to
be crystal clear for us and please
subscribe to my channel in case you
haven't already and I'm going to see you
soon
the seventh tutorial in this course and
in this tutorial we are going to
continue our discussion on data types
and we're going to check out some of the
options that are available to us in SQL
and in this tutorial we're just going to
see the options that are available to us
and we're not going to you know create
tables and we're not going to insert
data into tables and you know check out
the differences between data types we're
just going to see what is installed and
in the coming tutorials we're going to
you know do all that so it's going to
get easier for us to understand the
differences between data types and the
advantage is that you know some data
types all over the other so firstly we
are going to talk about the options that
we have for storing numbers in our
tables so you've got the big int data
type that you use to store really really
really really really large numbers and
you know then you've got the int data
type that you use to store reasonably
large numbers but not really large
numbers and I haven't included ranges
for both these data types because I
don't want to overwhelm you guys with
the numbers and ranges it's not
important for you to you know memorize
the actual ranges you just need to know
that if you're dealing with the you know
extremely large humongous values and you
use the big in there a type otherwise
for all practical purposes you can use
the int data type you've got the small
in data type in which you store values
that are between minus 32,768 and 30
2007 and 67 so if you sure that the
values are you going to store in you
know in in the field are going to be
between these two numbers and you can
use the small end data type otherwise if
you created a table that is going to
hold ten rows and you know that for nine
rows the value for the field is going to
be between the range that you see on the
screen and for one row the value is
going to be outside this range then it
would make sense for you to declare the
field as int instead of small int right
so it's it's always better to plan in
advance and sort of know you know what
values you might have to store in your
database you know at a future instants
of time and then you've got the tiny end
data type option in which you only store
or positive values between 0 and 255
then you've got the decimal and the
numeric data types right and these are
used to store fractional values and for
both these data types you have to
mention you know two things as arguments
so the first thing that you have to
mention is the size of the you know
value and by that I mean the display
length so if suppose you're storing 57.6
for the value of M or the display length
would be 4 because 57.6 4 in total has
got four digits right and then the value
for D which is the number of digits that
you have after the decimal point would
be 2 because we just have point six four
so you know six four makes two digits
and then you've got the float data type
and with float it's not necessary for
you to mention M or D as arguments in
that case it takes default values and
we're going to talk about default values
later on and for now just know that
these are the three options that you
have and then we have the day and time
data types so the first one for the
first one that we're gonna check out is
a date/time data type and with this
error type you store values in the
format that you see on screen so if
suppose you're storing 20th August 2013
11:42 p.m. and 15 seconds you know in a
field that has the date/time data type
then you'll first put in the ear number
which is 2 0 1 3 then you will put in 0
8 as you know values for mmm
because August is the 8th month of the
year and then for day you're going to
put 20 because it's 20th of August we're
talking about and then you have to
mention the time in the 24 hour format
so 11:42 p.m. is what 23 42 and then 15
seconds that would make you know 1 5 4 s
NS and then you've got the date type
which is pretty much like the date/time
datatype you know just - the time part
and you've got the time data type which
is just the same as daytime data type -
the date part and then you've also got
the ER data type which is like really
sweet and short and this one holds
only your values so you know if you're
going to put your values like 2005 and
2013 so you know you have you can use
the stereotype and then we've got three
options for characters too so the first
one that we're gonna check out is the ki
data type and with care you have to
specify the upper limit for for the
field right so if suppose you've
mentioned 60 as the upper limit then you
cannot store values that have more than
60 characters in the field and at the
same time you should know that care is a
fixed length they're a type and what I
mean by that is that you know no matter
how many characters you actually store
in the field the memory that would be
used to store those values would be the
same as the memory that's required to
store 60 characters right and for most
database systems that would be 60 bytes
so 60 bytes of memory would be occupied
even if you're storing just 10
characters or five characters if you're
just typing in hi or hello or something
like that you know you're using two or
five characters but the memory that
would be utilized would be of 60
characters so you're wasting memory and
with valkyr data type which is you know
variable and data type you sort of get
an advantage because you know if you're
using five then you're using memory only
for five so you're saving you know
memory space for 55 characters so you
know that's that's really an advantage
and then you've got the text error type
which is used to store large amounts of
data like blog entries or about me
descriptions and you know stuff like
that
and then you've also got the be lob or
the binary large object data type and
this one you use to store images or you
know short video files and those kind of
things so there are lots of other
options that we have available in SQL
and you know I've just discussed a few
that we're going to deal with in the
coming tutorials so I just want you guys
to be a little familiar with the
you know with the terms at least right
so if I type in blob somewhere or if I
type in jar or vodka then you know you
should know that we are talking about
you know binary there are types and
character datatypes respectively so
thank you so much for watching this
tutorial in the coming tutorials I
assure you that all of this is going to
be crystal clear for us and please
subscribe to my channel in case you
haven't already and I'm going to see you
soon
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Nov 24, 2024 Last updated |
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