What does mean in Oracle

Question

What does  lt   mean in SQL language  Sample code is as follows  SELECT ordid         prodid         qty FROM   item WHERE  prodid IN  SELECT prodid                   FROM   item                   WHERE  ordid   605         AND qty IN  SELECT qty                    FROM   item                    WHERE  ordid   605         AND ordid  lt  gt  605

User · Answer

It   lt  gt   is a function that is used to compare values in database table       Not equal to  functions the same as the  lt    Not equal to  comparison operator

User · Answer

In mysql extended version   lt  gt  gives out error  You are using mysql query Eventually  you have to use extended version of my mysql  Old will be replaced in future browser  Rather use something like   con   mysqli connect  host    username    password    databaseName     mysqli query  con   select orderid    650

User · Answer

It just means  different of   some languages uses     others  like SQL   lt  gt

User · Answer

It means not equal to     It s the same as    in C-like languages  but  lt   is ISO Standard and     Not equal to  not ISO standard

User · Answer

I m surprised nobody mentioned the null special case  I think the meaning of  lt  gt  is more something like      has a value which is not equal to   In this case it filters out items which have ordid 605 and items which have a null ordid   It may be obvious in this context that ordid is never null  but it is never hurts to remember that null is not  lt  gt  from 605  or from anything

User · Answer

It means  not equal to   So you re filtering out records where ordid is 605  Overall you re looking for any records which have the same prodid and qty values as those assigned to ordid 605  but which are for a different order

User · Answer

Does not equal  The opposite of    equivalent to      Also  for everyone s info  this can return a non-zero number of rows  I see the OP has reformatted his question so it s a bit clearer  but as far as I can tell  this finds records where product ID is among those found in order  605  as is quantity  but it s not actually order  605  If order  605 contains 1 apple  2 bananas and 3 crayons   604 should match if it contains 2 apples  but not 3 dogs   It just won t match order  605   And if ordid is unique  then it would find exact duplicates

User · Answer

It means not equal to  this is a good method to exclude certain elements from your query  For example lets say you have an orders tables and then you have OrderStatusID column within that table    You also have a status table where   0   OnHold   1   Processing   2   WaitingPayment   3   Shipped   4   Canceled    You can run a query where   Select   From  Orders  where OrderStatusID  lt  gt  4   this should give you all the orders except those that have been canceled   D

User · Answer

not equals  See here for a list of conditions

User · Answer

It means not equal to  Should I use    or  lt  gt  for not equal in TSQL   Have a look at the link  It has detailed explanation of what to use for what

[sql] What does "<>" mean in Oracle

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