Php mysqli select count query

Php php mysqli query to find count

This will produce following result − Example This will produce following result − php_function_reference.htm Definition and Usage if your last MySQLi function call executes MySQL query and if it generates any errors. This is an object representing a connection to MySQL Server. Return Values PHP mysqli_field_count() function returns an integer value indicating the number of columns in the result set of the last query.

MYSQLi Count and Group by

$result = mysqli_query("SELECT admin, COUNT(admin) as 'amount' FROM tablename GROUP BY admin"); while($row = mysqli_fetch_assoc($result)) echo "Name: " . $row['admin'] . " - ". $row['amount'] . "
"; 

Using count + GROUP by you can get the amount of times each admin appears in the table.

Php — Count rows from results of a «mysql_query», steps to get a count(): use mysql_query() to get count, use mysql_fetch_array() to get the only 1 row get the only one column of the row, this is the count, here is an example, which check whether the email is already used: // check

Best comparison operator when using COUNT in mysqli query

. "SELECT COUNT(`user_id`) as user_count . " . if ($result['user_count']) 

0 and ‘0’ are both false in PHP, so this does what you’re looking for very concisely.

Both are same, php takes care of string and number.

Internally functionality of php interpreter: If you compare a number with a string or the comparison involves numerical strings, then each string is converted to a number and the comparison performed numerically.

Have a look at: Comparison Operators

in your case it doesn’t matter since you are only using one =

Select Count Function From a MySQL Table in PHP, This tutorial will introduce the select count(*) function, count rows, and get the total records returned by a query from a MySQL table in PHP. Together with the tutorial are working sample codes and their output.

PHP mysqli_field_count() Function

Definition and Usage

The mysqli_field_count() function is used to get the number of fields (columns) in the result set of the recently executed MySQL query .

Syntax

Parameters

This is an object representing a connection to MySQL Server.

Return Values

PHP mysqli_field_count() function returns an integer value indicating the number of columns in the result set of the last query. If the last query is not a SELECT query (no result set) this function returns 0 .

PHP Version

This function was first introduced in PHP Version 5 and works works in all the later versions.

Example

Following example demonstrates the usage of the mysqli_field_count() function (in procedural style) −

This will produce following result −

Example

In object oriented style the syntax of this function is $con -> field_count; , Where, $con is the connection object −

 query("Select FIRST_NAME, LAST_NAME, AGE from employee"); //Field Count $count = $con->field_count; print("Field Count: ".$count); //Closing the connection $con -> close(); ?>

This will produce following result −

Example

Following is another example of the mysqli_field_count() function

This will produce following result −

Field Count: 0 Field Count: 0

Example

 mysqli_query($connection_mysql,"SELECT * FROM employee"); print(mysqli_field_count($connection_mysql)); mysqli_close($connection_mysql); ?>

This will produce following result −

Php — How to count returned rows number without, I am using GoDaddy shared hosting plan and looks like there are some issues on using the mysqli and mysqlnd in all versions of PHP 7,7.1,7.2, and 7.3 on their hosting. After many tries on changing and updating PHP versions and modules I, eventually, gave up using the get_result() function as I am getting this …

PHP mysqli_warning_count() Function

Definition and Usage

if your last MySQLi function call executes MySQL query and if it generates any errors. The mysqli_warning_count() function counts the number of errors generated by the last executed query and, returns the result.

Syntax

Parameters

This is an object representing a connection to MySQL Server.

Return Values

PHP mysqli_warning_count() function returns an integer value representing the number of warnings generated during the execution of last query. If there are no warnings during the last execution this function returns 0

PHP Version

This function was first introduced in PHP Version 5 and works works in all the later versions.

Assume we have created a table named Emp as follows −

CREATE TABLE EMP( ID TINYINT, First_Name VARCHAR(50) Not NULL, Last_Name VARCHAR(10) Not NULL, Date_Of_Birth date, Salary Int(255) );

Example

Following example demonstrates the usage of the mysqli_warning_count() function (in procedural style) −

This will produce following result −

Number of Warnings: 1 Number of Warnings: 2

Example

In object oriented style the syntax of this function is $con -> warning_count , Where, $con is the connection object −

 query("INSERT IGNORE into emp values(1, 'Sanjay', NULL, DATE('1981-12-05'), 2566)"); //Number of Warnings $count1 = $con->warning_count; print("Number of Warnings: ".$count1."\n"); //Inserting a record into the employee table $con -> query("INSERT IGNORE into emp values(15, 'Swetha', 'Yellapragada', DATE('1990-11-25'), 9986), (15, NULL, 'Prayaga', DATE('1990-11-25'), 9986)"); //Number of Warnings $count2 = $con->warning_count; print("Number of Warnings: ".$count2); //Closing the connection $con -> close(); ?>

This will produce following result −

Number of Warnings: 0 Number of Warnings: 2

Example

Following is another example of the function mysqli_warning_count() −

This will produce following result −

Insert ID (select query): 0 Insert ID: (multiple inserts) 6 Insert ID (update query): 0 Insert ID: (table with out auto incremented key) 0

Example

real_connect($servername, $username, $password, $dbname)) < die('Connect Error (' . mysqli_connect_errno() . ') '. mysqli_connect_error()); >print("Database connected" ."\n"); mysqli_query($conn, "CREATE TABLE sample (ID INT, Name VARCHAR(20))"); $query = "INSERT IGNORE INTO sample (id,name) VALUES( 1,'Rajesh Ramayan Kootrapally')"; mysqli_query($conn, $query); $warnings = mysqli_warning_count($conn); print("No.Of warnings in the query:".$warnings."\n"); if ($warnings) < if ($result = mysqli_query($conn, "SHOW WARNINGS")) < $row = mysqli_fetch_row($result); printf("%s (%d): %s\n", $row[0], $row[1], $row[2]); mysqli_free_result($result); >> mysqli_close($conn); ?>

This will produce following result −

Database connected No.Of warnings in the query:1 Warning (1265): Data truncated for column 'Name' at row 1

Get number of rows matched by UPDATE query with, Mar 29, 2015 at 19:50. Show 1 more comment. 2. You could run SELECT COUNT (*) with the same WHERE clause before running the UPDATE. That will give you a count of the number of rows that would be matched. Share. Improve this answer. answered Mar 13, 2011 at 13:01.

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Php mysqli select count query

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