我下面有一个工作表数据库：
id | market | process | lines | items
----+----------------------------------------------------+------------+-------+-------
1 | Spain | Pick | 25 | 100
3 | UK | Pick | 100 | 100
4 | USA | Pick | 75 | 90
5 | Metz | Pick | 10 | 20
6 | UK | Pick | 76 | 90
7 | ROW | Pick | 200 | 300
8 | Russia | Pick | 150 | 1000
9 | South Africa | Pick | 35 | 50
10 | Uk | Pick | 15 | 20
11 | USA | Pick | 123 | 123
12 | Spain | Pack | 25 | 25
13 | Spain | Pack | 50 | 100
14 | UK | Pack | 100 | 100
15 | USA | Pack | 75 | 90
16 | Metz | Pack | 10 | 20
17 | UK | Pack | 76 | 90
18 | ROW | Pack | 200 | 300
19 | Russia | Pack | 150 | 1000
20 | South Africa | Pack | 35 | 50
21 | Uk | Pack | 15 | 20
22 | USA | Pack | 123 | 123
2 | Spain | Pick | 90 | 100
我已经在php中创建了一个pg_query，如果在process列中输入了Pick，它将显示所有市场和行。这显示在HTML表中。的代码如下：
<?php
$db = pg_connect("host=localhost dbname=vcbv2 user=postgres");
$result = pg_query($db, "SELECT * FROM jobs WHERE process = 'Pick'");
echo "<table border='1'>";
echo "<tr><td>MARKET</td><td>PICK LINES TO DO</td></tr>\n";
while ($row = pg_fetch_assoc($result))
{
echo"<tr><td>{$row['market']}</td><td>{$row['lines']}</td></tr>\n";
}
echo"</table>";
?>
这将显示以下内容：
market | lines
----------------------------------------------------+-------
Spain | 25
UK | 100
USA | 75
Metz | 10
UK | 76
ROW | 200
Russia | 150
South Africa | 35
Uk | 15
USA | 123
Spain | 90
如您所见，在市场上有多个同名工作，即西班牙。
有没有一种方法，我将只显示一次名称，并将条目的行加起来并显示为总计。如下所示：
market | lines
----------------------------------------------------+-------
Spain | 115
UK | 191
USA | 198
Metz | 10
ROW | 200
Russia | 150
South Africa | 35
我不希望从Jobs表中删除任何条目，因为我需要其他条目。
这可能吗？
答案 0 :(得分：1)
Select market ,sum(lines) as lines_sum
from jobs WHERE process = 'Pick'
GROUP BY market