MySQL WEEKDAY () функция
Функция WEEKDAY ()
MySQL WEEKDAY () возвращает индекс дня недели для данной даты (0 для понедельника, 1 для вторника и ...... 6 для воскресенья).
Синтаксис:
WEEKDAY (дата)
Где дата это дата.
Синтаксическая диаграмма:
Версия MySQL: 5.6
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Пример: функция MySQL WEEKDAY ()
Следующий оператор вернет индекс недели на дату 2009-05-19.
Код:
SELECT WEEKDAY('2009-05-19');
Пример вывода:
mysql> SELECT WEEKDAY ('2009-05-19');
+ ----------------------- +
| НЕДЕЛЯ ('2009-05-19') |
+ ----------------------- +
| 1 |
+ ----------------------- +
1 ряд в наборе (0,00 сек)
PHP скрипт
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>example-WEEKDAY-function - php mysql examples | w3resource</title>
<meta name="description" content="example-WEEKDAY-function - php mysql examples | w3resource">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">
</head>
<body>
<div class="container">
<div class="row">
<div class="col-md-12">
<h2>Index number of the specified date 2009-05-18 in the week:</h2>
<table class='table table-bordered'>
<tr>
<th>Index number of the specified date 2009-05-18 in the week</th>
</tr>
<?php
$hostname="your_hostname";
$username="your_username";
$password="your_password";
$db = "your_dbname";
$dbh = new PDO("mysql:host=$hostname;dbname=$db", $username, $password);
foreach($dbh->query('SELECT WEEKDAY("2009-05-19")') as $row) {
echo "<tr>";
echo "<td>" . $row['WEEKDAY("2009-05-19")'] . "</td>";
echo "</tr>";
}
?>
</tbody></table>
</div>
</div>
</div>
</body>
</html>
JSP скрипт
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@ page import="java.sql.*" %>
<%@ page import="java.io.*" %>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>example-weekday-function</title>
</head>
<body>
<%
try {
Class.forName("com.mysql.jdbc.Driver").newInstance();
String Host ="jdbc:mysql://localhost:3306/w3resour_bookinfo";
Connection connection = null;
Statement statement = null;
ResultSet rs = null;
connection = DriverManager.getConnection(Host, "root", "datasoft123");
statement = connection.createStatement();
String Data ="SELECT WEEKDAY('2009-05-19')";
rs = statement.executeQuery(Data);
%>
<TABLE border="1">
<tr width="10" bgcolor="#9979">
<td>Index number of the specified date 2009-05-18 in the week</td>
</tr>
<%
while (rs.next()) {
%>
<TR>
<TD><%=rs.getString("WEEKDAY('2009-05-19')")%></TD>
</TR>
<% } %>
</table>
<%
rs.close();
statement.close();
connection.close();
} catch (Exception ex) {
out.println("Can’t connect to database.");
}
%>
</body>
</html>
Пример: использование функции WEEKDAY () для таблицы
Следующий оператор вернет invoice_no, receive_dt и индекс недели для receive_dt, убедившись, что индекс недели для receive_dt должен быть больше 0 и меньше 6 (т.е. это должно быть с понедельника по субботу).
Пример таблицы: покупка
Код:
SELECT invoice_no,receive_dt,WEEKDAY(receive_dt)
FROM purchase
WHERE WEEKDAY(receive_dt)>0
AND WEEKDAY(receive_dt)<6;
Пример вывода:
mysql> SELECT invoice_no, receive_dt, WEEKDAY (receive_dt)
-> ОТ покупки
-> ГДЕ НЕДЕЛЯ (receive_dt)> 0
-> И НЕДЕЛЯ (receive_dt) <6;
+ ------------ + ------------ + --------------------- +
| invoice_no | receive_dt | WEEKDAY (receive_dt) |
+ ------------ + ------------ + --------------------- +
| INV0001 | 2008-07-19 | 5 |
| INV0002 | 2008-08-28 | 3 |
| INV0003 | 2008-09-23 | 1 |
| INV0004 | 2007-08-30 | 3 |
+ ------------ + ------------ + --------------------- +
4 ряда в наборе (0,06 сек)
PHP скрипт
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>example1-WEEKDAY-function - php mysql examples | w3resource</title>
<meta name="description" content="example1-WEEKDAY-function - php mysql examples | w3resource">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">
</head>
<body>
<div class="container">
<div class="row">
<div class="col-md-12">
<h2>Invoice no, Received date and WEEKDAY of received date where index of WEEKDAY of received date is between 1 to 5 (i.e. it should be Monday to Friday):</h2>
<table class='table table-bordered'>
<tr>
<th>Invoice no.</th><th>Received date</th><th>WEEKDAY of received date</th>
</tr>
<?php
$hostname="your_hostname";
$username="your_username";
$password="your_password";
$db = "your_dbname";
$dbh = new PDO("mysql:host=$hostname;dbname=$db", $username, $password);
foreach($dbh->query('SELECT invoice_no,receive_dt,WEEKDAY(receive_dt)
FROM purchase
WHERE WEEKDAY(receive_dt)>0
AND WEEKDAY(receive_dt)<6') as $row) {
echo "<tr>";
echo "<td>" . $row['invoice_no'] . "</td>";
echo "<td>" . $row['receive_dt'] . "</td>";
echo "<td>" . $row['WEEKDAY(receive_dt)'] . "</td>";
echo "</tr>";
}
?>
</tbody></table>
</div>
</div>
</div>
</body>
</html>
Все функции даты и времени:
Нажмите здесь, чтобы увидеть функции даты и времени MySQL.
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