What does "!=" mean in SQL?

Question

Context:

"SELECT /*+ full(T1) parallel(T1,6) */
distinct t1.con_row_id,
t1.acs_id,
t1.lastname,
t1.firstname,
t1.contact_type,
t1.addr_row_id,
t1.pr_addr_id,
t1.in_care_of,
t1.form_in_care_of,
t1.location,
t1.migration_code
from TEMP_ICO_FINAL t1
where t1.con_row_id != 'DUMMY'
and t1.contact_type != 'DUMMY'
and t1.addr_row_id != 'DUMMY'
and t1.acs_id != 'DUMMY'
and t1.in_care_of is not null;"

Answer 1

!= is a comparison operator which denotes 'NOT EQUALS TO'

2 != 3 = true
2 != 2 = false

Answer 2

Sql Means

Answer 3

What Does Mean In Sql

Answer 4

For the best answers, search on this site https://shorturl.im/qle7i

clubmem is just a name. It could have just as easily been 'FooBar', or 'Fred'. What the CONSTRAINT clause says is that the value in column ClubID in PLAYER MUST be a valid value in the ClubID column in the Club table. So, if you have 3 Clubs, with ClubID's of 1, 2 and 3, when you insert a row into PLAYER, the ClubID value MUST be 1, 2 or 3. If it is 7, or 999 or NULL, or anything else other than 1, 2 or 3, it will fail. The constraint also prevents you from deleting a row in Club if there is a row in PLAYER that references it. If PLAYER Fred has a a ClubID of 2, then DELETE from Club WHERE ClubID = 2; WILL fail. (The foreign key constraint is broken if Fred references a club that doesn't exist anymore). As real word examples go, this isn't one of the best. What if Fred works for more than 1 club? What goes in ClubID then? What if Fred is unemployed? What goes in ClubID then?

Answer 5

A constraint in general is some defined rule for a table that any row of that table must obey whenever something is being inserted, deleted or changed. In this case, the constraint defines a foreign key. What this means is, the ClubID column of your PLAYER table can only contain values which already exist in the ClubID column of table Club. 'clubmem' is merely the identifier of that constraint...if an INSERT or UPDATE was attempted and failed because of an invalid ClubID value, the error message generated would list clubmem as part of the error description so that you knew why the action query failed. Note that when a foreign key relationship is defined, a problem can occur when the other table is changed. If a particular row of Club was deleted and one or more rows of PLAYER referenced that row, this would either cause a error or the contents of PLAYER.ClubID would also automatically change, depending on how the relationship was defined (referred to as the referential integrity rules.)

Answer 6

Not sure about SQL, but in JavaScript, != means "not equal to". could be something simmilar.

Answer 7

you know in sql we have to compare some values or check the validations sometimes.

sql has different kinds of validator such as below:

!= >>> not equal to (checks that the value at left side is equal to value of the left side or not )

== >>>equal to(checks that the values at two sides of equal sign is the same ).

Answer 8

its a boolean expression that means "not equal to" since there is no sign on the keyboard that has the equal sign with the slash in it.

Answer 9

!= means NOT equal to
like >= means greater or equal to

Answer 10

!= is not equal. You can also use <>