[英]MYSQL use 'LIKE' in 'WHERE' clause to search in subquery
您将如何使用“LIKE”在子查询中进行搜索?
例如,我试过这样做,但没有用:
SELECT *
FROM mytable
WHERE name
LIKE '%
(SELECT name FROM myothertable)
%'
到目前为止我有这个:
SELECT * FROM t1
WHERE t1.name IN (SELECT t2.name FROM t2)
AND (t1.title IN (SELECT t2.title FROM t2)
OR t1.surname IN (SELECT t2.surname FROM t2))
它工作正常,因为它返回完全匹配,但它似乎没有返回我的其他类似记录,所以我还想检查一下:
t1.title LIKE '%t2.title%' AND t1.surname LIKE '%t2.surname%'
我该怎么做?
使用连接:
SELECT a.*
FROM mytable a
JOIN myothertable b ON a.name LIKE CONCAT('%', b.name, '%')
...但是如果给定的mytable
记录在myothertable
中有多个匹配项,则可能存在重复项。
使用存在:
SELECT a.*
FROM mytable a
WHERE EXISTS (SELECT NULL
FROM myothertable b
WHERE a.name LIKE CONCAT('%', b.name, '%'))
使用全文搜索MATCH
(要求myothertable
是 MyISAM)
SELECT a.*
FROM mytable a
JOIN myothertable b ON MATCH(a.name) AGAINST (b.name)
例如:
SELECT a_column
FROM mytable t
WHERE EXISTS (
SELECT 1
FROM myothertable ot
WHERE t.`name` LIKE '%' || ot.`name` || '%');
就术语而言:这称为相关子查询。
只是另一种方式:
select a.field, b.code
from table1 a
inner join (select code from table2 where ....) b on a.field like CONCAT('%', b.code, '%')
这个字符串对我来说很好用。
"SELECT * FROM table1 WHERE field like CONCAT('%', (SELECT id FROM table2), '%')";
最好的方法是创建名为 NameMatch() 的 function
最终查询:
SELECT * FROM mytable WHERE dbo.NameMatch(name) = 1
function 看起来像:
create function dbo.NameMatch
(@_name varchar(100))
returns bit
as begin
declare @res bit
if exists (select 1 from myothertable where @_name like '%' + name + '%' )
set @res = 1
else set @res = 0
return @res
end
对我有用
SELECT *
FROM mytable
WHERE name
LIKE CONCAT('%',(SELECT name FROM myothertable),'%')
SELECT *
FROM t1
WHERE t1.name IN (SELECT t2.name FROM t2)
AND (t1.title IN (SELECT t2.title FROM t2)
OR t1.surname IN (SELECT t2.surname FROM t2))
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