How to use count in sql query

How to use count in SQL query

How to use count in SQL query: In SQL Server COUNT (), the aggregate function is used to display the average value of the records. The COUNT () function can be used with different keywords. The COUNT () function of the SQL server can also be used with the select where clause.

COUNT() aggregate function syntax with example:

            Syntax: Select COUNT([DISTINCT *|COLUMN_NAME]) From TABLE_NAME Where COLUMN_NAME='VALUE'

Description:
                 Select: SQL Server keyword.
                 COUNT(): SQL Server aggregate function.
                 *: - Indicate all columns.
                 DISTINCT: SQL Server keyword.
                 COLUMN_NAME: Name of column.
                 From: SQL Server Keyword.
                 TABLE_NAME: Name of table.
                 Where: SQL Server keyword.
                 'VALUE': User value.


COUNT() Aggregate function with example:

Here is a table name ItemDetails

ItemCode	ItemName	ManufactureCompany	ItemSerialNo	ItemCategory	ItemQuantity	ItemPrice	ProductCountry
1	Samsung Mobile	Samsung	S12345	Mobile	500	240	Korea
2	Samsung Pro	Samsung	SP1234	Mobile	100	300	Korea
3	Samsung Headphone	Samsung	SH2345	Headphone	50	50	Korea
4	iPhone	iPone	iP12345	Mobile	1000	500	United Stat
5	Apple Mobile	Apple	A12345	Mobile	200	300	United Stat
6	Apple Computer	Apple	A12343	Computer	200	400	United Stat
7	Apple Macbook	Apple	AM2345	Macbook	50	600	United Stat
8	Dell Computer	DELL	D02345	Computer	200	240	United Stat
9	Dell Laptop	DELL	DL2345	Laptop	30	240	United Stat
10	Apple Laptop	Apple	AL2345	Laptop	500	100	United Stat
11	Apple Headphone	Apple	AH2345	Headphone	50	20	United Stat
12	Sony Camera	Sony	SN2345	Camera	200	240	Japan
13	Sony Headphone	Sony	SNH345	Headphone	500	50	Japan
14	Ascer Computer	Ascer	AC2345	Computer	100	600	China
16	Borother Printer	Brother	B12345	Printer	200	200	China
17	Ascer Printer	Ascer	AP2345	Printer	200	150	China
18	Brother Photocopy	Brother	BP2345	Printer	20	150	China
19	Brother Multi Printer	Brother	Photocopy	BM243	NULL	NULL	India

Example COUNT(*) aggregate function:

Now,

Select COUNT(*)as NumberOfRecords from ItemDetails

Result: [Note: Count all rows and display)

NumberOfRecords

18

Select COUNT(ItemQuantity)As NumberValueRecords from ItemDetails

Result: [Note: Ignore the NULL value.]

NumberValueRecords

17

Select COUNT(distinct ManufactureCompany) As CompanyName from ItemDetails

Result: [Note: Ignore the duplicate value.]

CompanyName

7

Select COUNT(distinct ProductCountry)As NumberOfProductCounry from ItemDetails

Result:

NumberOfProductCounry

5

Select COUNT(ManufactureCompany) As ManufactureCompanyName from ItemDetails where ManufactureCompany='DELL'

Result: 

ManufactureCompanyName

2

Select COUNT(ManufactureCompany) As ManufactureCompanyName from ItemDetails where ManufactureCompany='Samsung'

Result:

ManufactureCompanyName2

2

.

Select COUNT(ProductCountry) As ProductCountry from ItemDetails where ProductCountry='United Stat'

Result:

ProductCountry

8

COUNT() aggregate function example in video:

COUNT() aggregate function example in image

[Note: We have created and inserted values into sql table in previous topic. For more details Click here.
OR
Execute the follow command in your sql query window for executing above sql select where statement]
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Create Table ItemDetails

(

ItemCode int,

ItemName varchar(30),

ManufactureCompany varchar(50),

ExpiredDate date,

ItemSearialNo varchar (30),

ItemCategory varchar(30),

ItemQuantity int,

ItemPrice float,

ProductCountry varchar(30),

ReceivedDate date,

ItemImage image

)

Insert into ItemDetails values('1','Samsung Mobile','Samsung','12-10-2024','12-01-2050','S12345','Mobile','500','240','Korea','12-10-2025')
Insert into ItemDetails values('2','Samsung Pro','Samsung','12-10-2024','12-01-2050','SP1234','Mobile','100','300','Korea','12-10-2025')
Insert into ItemDetails values('3','Samsung Headphone','Samsung','12-10-2023','12-01-2053','SH2345','Headphone','50','50','Korea','12-10-2025')
Insert into ItemDetails values('4','iPhone','iPone','12-01-2024','12-01-2049','iP12345','Mobile','1000','500','United Stat','12-10-2025')
Insert into ItemDetails values('5','Apple Mobile','Apple','12-11-2024','12-01-2049','A12345','Mobile','200','300','United Stat','12-10-2025')
Insert into ItemDetails values('6','Apple Computer','Apple','12-02-2024','12-01-2050','A12343','Computer','200','400','United Stat','12-10-2025')
Insert into ItemDetails values('7','Apple Macbook','Apple','12-11-2024','12-01-2050','AM2345','Macbook','50','600','United Stat','12-10-2025')
Insert into ItemDetails values('8','Dell Computer','DELL','12-09-2024','12-01-2050','D02345','Computer','200','240','United Stat','12-10-2025')
Insert into ItemDetails values('9','Dell Laptop','DELL','12-09-2024','12-01-2050','DL2345','Laptop','30','240','United Stat','12-10-2025')
Insert into ItemDetails values('10','Apple Laptop','Apple','12-08-2024','12-01-2050','AL2345','Laptop','500','100','United Stat','12-10-2025')
Insert into ItemDetails values('11','Apple Headphone','Apple','12-12-2024','12-01-2050','AH2345','Headphone','50','20','United Stat','12-10-2025')
Insert into ItemDetails values('12','Sony Camera','Sony','12-11-2024','12-11-2050','SN2345','Camera','200','240','Japan','12-11-2025')
Insert into ItemDetails values('13','Sony Headphone','Sony','12-09-2024','12-01-2050','SNH345','Headphone','500','50','Japan','12-11-2025')
Insert into ItemDetails values('14','Ascer Computer','Ascer','12-09-2024','12-07-2050','AC2345','Computer','100','600','China','12-10-2025')
Insert into ItemDetails values('16','Borother Printer','Brother','12-09-2024','12-01-2050','B12345','Printer','200','200','China','12-10-2025')

Insert into ItemDetails values('19','Brother Multi Printer','Brother',GETDATE(),'2050-10-10','Photocopy','BM243',null,null,'India',GETDATE())

Insert into ItemDetails (ItemCode,ItemName,ManufactureCompany,ProductDate,ExpiredDate,ItemSearialNo,ItemCategory,ItemQuantity,ItemPrice,ProductCountry,ReceivedDate) values('17','Ascer Printer','Ascer','12-09-2024','12-07-2050','AP2345','Printer','200','150','China','12-10-2025')
Insert into ItemDetails (ItemCode,ItemName,ManufactureCompany,ProductDate,ExpiredDate,ItemSearialNo,ItemCategory,ItemQuantity,ItemPrice,ProductCountry,ReceivedDate) values('18','Brother Photocopy','Brother','12-08-2024','12-07-2050','BP2345','Printer','20','150','China','12-10-2025')

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