Question

我从3个不同的表中选择一些值，例如

$result=mysql_query("select a.party_name, a.app_date, a.receive_date, a.case_type, c.order_date from party_details a, case_decision b, assign_advocate c where MONTHNAME(b.date)='$month' and YEAR(b.date)='$year' and a.partyid=b.party_id and a.partyid=c.party_id and c.status='1'");

但是我想从底部只选择1个值或者按表c（case_decision）的降序说。

我该怎么办？请告诉我。感谢名单..

Answer 1

 SELECT * FROM table_list ORDER BY col_name DESC LIMIT 1;

Answer 2

'order by'将根据列进行排序 'desc'按降序排序

$result=mysql_query("select a.party_name, a.app_date, a.receive_date, a.case_type, c.order_date from party_details a, case_decision b, assign_advocate c where MONTHNAME(b.date)='$month' and YEAR(b.date)='$year' and a.partyid=b.party_id and a.partyid=c.party_id and c.status='1' order by a.party_name desc");

Answer 3

在limit 1

之后使用order by your_column_name desc

Answer 4

使用orderby子句

示例（语法）：

SELECT * FROM YOUR_TABLE_NAME ORDER BY YOUR_COL_NAME DESC LIMIT 1;

在你的情况下，你应该这样做：

$result=mysql_query("select a.party_name, a.app_date, a.receive_date, a.case_type, 
c.order_date from party_details a, case_decision b, assign_advocate c where 
MONTHNAME(b.date)='$month' and YEAR(b.date)='$year' and a.partyid=b.party_id and 
a.partyid=c.party_id and c.status='1' **ORDER BY YOUR_COLOUM_NAME  DESC LIMIT 1** ");

Answer 5

Please replce column name as per table design below statement :

$ result = mysql_query（“select a.party_name，a.app_date，a.receive_date，a.case_type， c.order_date来自party_details a，case_decision b，assign_advocate c其中 MONTHNAME（b.date）='$ month'和YEAR（b.date）='$ year'和a.partyid = b.party_id和 a.partyid = c.party_id和c.status ='1'顺序由col_name desc limit 1“）;

Answer 6

您必须将以下查询中的<column>替换为您希望订单所依据的列的引用。

select a.party_name, a.app_date, a.receive_date, a.case_type, c.order_date
from party_details a, case_decision b, assign_advocate c
where MONTHNAME(b.date)='$month' and YEAR(b.date)='$year'
and a.partyid=b.party_id and a.partyid=c.party_id and c.status='1'
order by <column> desc
limit 1

如何从表格底部选择

6 个答案: