MYSQL select using concat with not in statment - mysql

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.)