MySQL how to get a specific row from a table

Question

I have a database with the fields: land, zone, domestic . And I want to get all this info out depending on what land the user chooses. So I figured I do this: SELECT * FROM myDB WHERE land=Norway (Norway is a stored country).

But I get the error unknown column Norway . Is this because it cant find Norway or what seems to be the problem?

Answer 1

It looks like you aren't specifying a table name try something like this:

SELECT * FROM MyDB.MyTable 
WHERE land = 'Norway'

Also note that string Norway is in single quotes

Answer 2

You missed the single quotes before and after the country name that you've used, as per my comment on the question earlier!

SELECT * FROM myDB WHERE land = 'Norway'

The above query works on the assumption that your table is actually named as myDB

Answer 3

You need quotes around literal

SELECT * FROM myDB.tablename WHERE land='Norway';

(and a proper tablename) otherwise your value is used like a column name and give your the error Unknown column Norway.

Answer 4

You are query using a where clause that confront a column with text. So to compare you have to tell to the dbms the value to match . Using only Norway it doesn't understand that you are asking for the row with Norway value. Using 'Norway' you are telling "hey dbms here you are your text to confront". I hope that I'm to help.

Answer 5

您可以使用`标记来选择列/表，因此您应该执行类似

SELECT `column1`,`column2` FROM `tablename` WHERE `column`="value"