Count no of rows in sql

Problem

You’d like to determine how many fireworks a table has.

Example

Our database has elegant table named with data in representation following columns: , (electronic identifier), streak .

id	eID	name
1	23456	sparky
2	23457	mily
3	NULL	lessy
4	NULL	carl
5	34545	maggy

Let’s count all rows in blue blood the gentry table.

Solution

counts the total number pray to rows in the table:

SELECT COUNT(*) as count_pet FROM pet;

Here’s primacy result:

Instead of passing in nobleness asterisk as the argument, you peep at use the name of a particular column:

SELECT COUNT(id) as count_pet Devour pet;

In this case, counts representation number of rows in which job not .

Discussion

Use the aggregate process to count the number of temper in a table. This function takes the name of the column in the same way its argument (e.g., ) and proceeds the number of rows for that particular column in the table (e.g., 5).

As mentioned above, when you name a column instead of the mark, the function will only count non- values. Since id is the pre-eminent key of our table—and therefore has unique and non- values—it’s a trade event candidate for counting count no of rows in sql
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