尝试使用where子句从两个不同的表中提取时出现MySQL查询错误

Question

I am not able to retrieve query result when I am trying to extract data from two different table where column data matches(b/w column of first table and column of second table)

I used following 2 methods:

 SELECT a.*, FROM `table1` a, `table2` b
 WHERE a.`synonyms` in (b.`synonyms`);

or

SELECT a.*, FROM `table1` a, `table2` b
WHERE a.`synonyms`=b.`synonyms`;

and

SELECT * FROM `table1` where `synonyms` in (SELECT `synonyms`from `table2`WHERE 1);

First Query showing error:

#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'FROM `table1` a, `table2` b  WHERE' at line 1

---

Second query is running long time and then at the end displaying nothing except: show your query.

What mistake am I making here?

PS: tabel1 and table both having synonyms column (value of synonym is in varchar). around 300k synonyms(eg:gene name) are there in table1. table2 have around 5000 synonyms which also exsist in table1. I want to extract those 5000 from table1 with extra information it contain.

    SELECT * FROM `table1` where `synonyms` in ('synonym1','synonym2','synonym3','synonym4'); 

Answer 1

将SELECT a.*, FROM更改为SELECT a.* FROM

Answer 2

In the second query you should define WHERE... = 'something'.

The right syntax is WHERE column_name operator value;

In first query you should remove comma like pointed already.

Answer 3

Change

 SELECT a.*, FROM

to

SELECT a.* FROM

plus use join in your query like

SELECT a.* FROM `table1` a join `table2` b on (a.synonyms=b.synonyms);