MYSQL选择使用concat与不在陈述

Question

can someone correct me on this syntax error. am trying to search users by firstname, lastname and their email

SELECT
  USERID,
  FNAME,
  LNAME
FROM
  USERS
WHERE
  CONCAT(FNAME, ', ', LNAME, ', ', EMAIL) LIKE CONCAT('%', REPLACE('keyword ', ' ', '%'), '%', '%') NOT IN (
    SELECT
      PRODUCT_ID
    FROM
      ITEMS
    WHERE
      USER = 'JANE'
      AND PRICE = '400'
      AND ORDER = 'PAID'
  )

i want to search and get userid,firstname and lastname. but i dont want to get jane, price = 400 and order = paid

TABLE USER

USERID        FNAME     LNAME          EMAIL 
1             JANE      DEO          TES@TED.COM
2              KEL      DEO          TES@TED.COM
3              MK       DEO          TES@TED.COM


TABLE ITEMS 

PRODUCT_ID  PRICE    ITEM_NUM  USER    USERID
1           400        40      JANE       1
2           200        20      KEL        2
3           100        10      MK         3

so i want to get the rest people apart from JANE ROW

AND MY TRY IS

SELECT SND.USERID, SND.FNAME, SND.LNAME WHERE CONCAT(FNAME, ', ', LNAME, ', ', EMAIL) LIKE CONCAT('%', REPLACE('keyword', ' ', '%'), '%', '%') FROM items as M JOIN users as SND ON SND.USERID WHERE NOT EXISTS(SELECT * FROM ITEMS WHERE M.USER = 'JANE' AND M.PRICE ='400' AND M.ITEM_NUM ='40')

Answer 1

You cannot include a where clause between the select and the from clauses

SELECT
   SND.USERID
 , SND.FNAME
 , SND.LNAME

>> no where clause here

FROM items AS M
INNER JOIN users AS SND ON SND.USERID
WHERE NOT EXISTS (
  SELECT *
  FROM ITEMS
  WHERE M.USER = 'JANE'
   AND M.PRICE = '400'
   AND M.ITEM_NUM = '40'
  )

Just include all the wanted conditions int the one (and only) where clause, combine those using AND's or OR's as needed. I have changed the join condition, and altered the NOT syntax used also.

SELECT
   SND.USERID
 , SND.FNAME
 , SND.LNAME
FROM items AS M
INNER JOIN users AS SND ON M.userid = SND.userid
WHERE CONCAT(FNAME, ', ', LNAME, ', ', EMAIL) LIKE CONCAT('%', REPLACE('keyword', ' ', '%'), '%', '%') 
AND NOT (
       M.USER = 'JANE'
   AND M.PRICE = '400'
   AND M.ITEM_NUM = '40'
  )

I'm not that comfortable with your use of concat() in the above however, it looks very inefficient, instead why not just repeat the LIKE tests on each column. (Yes it may make the SQL code longer, but that is not an indicator of the execution time of the query.)

SELECT
   SND.USERID
 , SND.FNAME
 , SND.LNAME
FROM items AS M
INNER JOIN users AS SND ON M.userid = SND.userid
WHERE (
   SND.FNAME LIKE CONCAT('%', REPLACE('keyword', ' ', '%'))
or SND.LNAME LIKE CONCAT('%', REPLACE('keyword', ' ', '%'))
or SND.EMAIL LIKE CONCAT('%', REPLACE('keyword', ' ', '%'))
)
AND NOT (
       M.USER = 'JANE'
   AND M.PRICE = '400'
   AND M.ITEM_NUM = '40'
  )

Note the use of indents and parentheses when using or in a where clause. (You do not have to place SQL into one row, not sure why you did that in the question.)