I have the following 2 SQL syntax that I'm looking to combine into 1 SQL syntax
SELECT sentFrom
FROM tableName
WHERE id = :varid
AND sentFrom != :vartext
SELECT sentTo
FROM tableName
WHERE id = :varid
AND sentTo != :vartext
I guess I should give an example:
MYSQL TABLE
-----------------------------------
sentFrom sentTo
1 2
1 3
2 1
2 3
query
select sentFrom where sentFrom != 1 and select sentTo where sentTo != 1
Returns:
sentTo 2 but not sentFrom 1
sentTo 3 but not sentFrom 1
sentFrom 2 but not sentTo 1
sentFrom 2 and sentTo 3
Syntex of select query is :
Select Colname1,Colname2,.... from tablename
where colname=value and/or ...
group by cond..
having cond...
order by colname, colname asc/desc
======================================
Ex:
SELECT sentFrom,sentTo FROM tableName
WHERE id = :varid AND (sentFrom != :vartext or sentTo != :vartext)
I think this should help.
SELECT a.sentFrom , b.sentTo FROM
(SELECT id, sentFrom FROM tableName WHERE id = :varid AND sentFrom != :vartext) a
JOIN
(SELECT id, sentTo FROM tableName WHERE id = :varid AND sentTo != :vartext) b
ON a.id = b.id;
If you think, ID
is not common in the rows selected in each query then remove the join condition ON a.id = b.id
. In that case it will return you the Cartesian product
of records of query one to query 2.
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.