Select data where column from table is different from column from another table

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I need to select data from a table (table1) where a specific column is different from another column from another table(table2)

Something like that:

SELECT * FROM table1 WHERE table1.column1 != table2.column2

I do the change like this :

SELECT * FROM table1
inner join table2 on table1.id = table2.id
WHERE table1.column1 != table2.column2

I have a table(table1) that I store some people.I need to select random, one by one and add to another table(table2).If a person it's added ,that person can be selected one more time until all the people are selected . This is my query :

SELECT * FROM people inner join people_generated on people.id = people_generated.id WHERE people.id != people_generated.id_people ORDER BY RAND() LIMIT 1 

This return a empty result : "MySQL returned an empty result set"

The second table "people_genrated" is empty so,remain people to generate.Why result is empty?

Try Something like this,

SELECT t1.name FROM table1 t1
LEFT JOIN table2 t2 ON t2.name = t1.name
WHERE t2.name IS NULL

SQL INSERT INTO SELECT Statement | Values, SQL Select Distinct · SQL Min, Max · SQL Count INSERT INTO SELECT copies data from one table to another table. INSERT INTO INSERT INTO table-name (​column-names); SELECT column-names; FROM table-name; WHERE condition​  select m.*, (select u1.name from users as u1 where m.userid1 = u1.userid) as username1, (select u2.name from users as u2 where m.userid2 = u2.userid) as username2 from maintable as m. share.

Try this,

SELECT * FROM table1
inner join table2 on table1.id = table2.id
WHERE table1.column1 != table2.column2

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Try this one.

 Select rooms.single from rooms where rooms.single<>checkin.room_no;

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Query to Copy Data from One Column into Another in Same Table, Query to Copy Data from One Column into Another in Same Table. I want to UPDATE TABLE A SET column1=SELECT (column2) FROM A. share this I think that will work if you are not trying to get values from a different table. Thanks, First add the new column in each table. You should the have 3 tables with 3 columns. All columns have the same column headings . then append the tables into 1 long table.

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Comments
  • Can you explain why you use LEFT JOIN?
  • @HamletHakobyan, join changed to inner, Thanks!