what does this symbol mean := in sql
what does this mean
:=
in sql ?
if found some sql using like that symbol example
select col1, col2, @pv:=col3 as 'col3' from table1
join
(select @pv:=1)tmp
where col1=@pv
Thank you in advance.
mysql sql colon-equals
edited Nov 13 '18 at 13:14
Moody_Mudskipper
21.8k32864
asked Dec 19 '14 at 6:47
ashTonashTon
3962719
add a comment |
what does this mean
:=
in sql ?
if found some sql using like that symbol example
select col1, col2, @pv:=col3 as 'col3' from table1
join
(select @pv:=1)tmp
where col1=@pv
Thank you in advance.
mysql sql colon-equals
edited Nov 13 '18 at 13:14
Moody_Mudskipper
21.8k32864
asked Dec 19 '14 at 6:47
ashTonashTon
3962719
:=is assignment operator.
– Grijesh Chauhan
Dec 19 '14 at 6:53
add a comment |
what does this mean
:=
in sql ?
if found some sql using like that symbol example
select col1, col2, @pv:=col3 as 'col3' from table1
join
(select @pv:=1)tmp
where col1=@pv
Thank you in advance.
mysql sql colon-equals
edited Nov 13 '18 at 13:14
Moody_Mudskipper
21.8k32864
asked Dec 19 '14 at 6:47
ashTonashTon
3962719
what does this mean
:=
in sql ?
if found some sql using like that symbol example
select col1, col2, @pv:=col3 as 'col3' from table1
join
(select @pv:=1)tmp
where col1=@pv
Thank you in advance.
mysql sql colon-equals
mysql sql colon-equals
edited Nov 13 '18 at 13:14
Moody_Mudskipper
21.8k32864
asked Dec 19 '14 at 6:47
ashTonashTon
3962719
edited Nov 13 '18 at 13:14
Moody_Mudskipper
21.8k32864
asked Dec 19 '14 at 6:47
ashTonashTon
3962719
edited Nov 13 '18 at 13:14
Moody_Mudskipper
21.8k32864
edited Nov 13 '18 at 13:14
Moody_Mudskipper
21.8k32864
edited Nov 13 '18 at 13:14
Moody_Mudskipper
21.8k32864
21.8k32864
asked Dec 19 '14 at 6:47
ashTonashTon
3962719
asked Dec 19 '14 at 6:47
ashTonashTon
3962719
asked Dec 19 '14 at 6:47
ashTonashTon
3962719
3962719
:=is assignment operator.
– Grijesh Chauhan
Dec 19 '14 at 6:53
add a comment |
:=is assignment operator.
– Grijesh Chauhan
Dec 19 '14 at 6:53
:= is assignment operator.– Grijesh Chauhan
Dec 19 '14 at 6:53
:= is assignment operator.– Grijesh Chauhan
Dec 19 '14 at 6:53
add a comment |
1 Answer
1
active
oldest
votes
using this: here variable are prepended with an @ sign to suggest user-defined variable.A variable, without @, is a system variable, which you cannot define yourself.
SET @pv:=1// we set a variable
i.e := is used as assignment operator like normal = else where.
see here:http://dev.mysql.com/doc/refman/5.0/en/user-variables.html
and also see a good post here:MySQL: @variable vs. variable. Whats the difference?
edited May 23 '17 at 10:29
Community♦
11
answered Dec 19 '14 at 6:52
Suchit kumarSuchit kumar
10.8k31436
Thank you.what about the @ ?
– ashTon
Dec 19 '14 at 6:55
@ashTon @ sign to suggest user-defined variable.
– Suchit kumar
Dec 19 '14 at 6:58
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
using this: here variable are prepended with an @ sign to suggest user-defined variable.A variable, without @, is a system variable, which you cannot define yourself.
SET @pv:=1// we set a variable
i.e := is used as assignment operator like normal = else where.
see here:http://dev.mysql.com/doc/refman/5.0/en/user-variables.html
and also see a good post here:MySQL: @variable vs. variable. Whats the difference?
edited May 23 '17 at 10:29
Community♦
11
answered Dec 19 '14 at 6:52
Suchit kumarSuchit kumar
10.8k31436
Thank you.what about the @ ?
– ashTon
Dec 19 '14 at 6:55
@ashTon @ sign to suggest user-defined variable.
– Suchit kumar
Dec 19 '14 at 6:58
add a comment |
using this: here variable are prepended with an @ sign to suggest user-defined variable.A variable, without @, is a system variable, which you cannot define yourself.
SET @pv:=1// we set a variable
i.e := is used as assignment operator like normal = else where.
see here:http://dev.mysql.com/doc/refman/5.0/en/user-variables.html
and also see a good post here:MySQL: @variable vs. variable. Whats the difference?
edited May 23 '17 at 10:29
Community♦
11
answered Dec 19 '14 at 6:52
Suchit kumarSuchit kumar
10.8k31436
Thank you.what about the @ ?
– ashTon
Dec 19 '14 at 6:55
@ashTon @ sign to suggest user-defined variable.
– Suchit kumar
Dec 19 '14 at 6:58
add a comment |
using this: here variable are prepended with an @ sign to suggest user-defined variable.A variable, without @, is a system variable, which you cannot define yourself.
SET @pv:=1// we set a variable
i.e := is used as assignment operator like normal = else where.
see here:http://dev.mysql.com/doc/refman/5.0/en/user-variables.html
and also see a good post here:MySQL: @variable vs. variable. Whats the difference?
edited May 23 '17 at 10:29
Community♦
11
answered Dec 19 '14 at 6:52
Suchit kumarSuchit kumar
10.8k31436
using this: here variable are prepended with an @ sign to suggest user-defined variable.A variable, without @, is a system variable, which you cannot define yourself.
SET @pv:=1// we set a variable
i.e := is used as assignment operator like normal = else where.
see here:http://dev.mysql.com/doc/refman/5.0/en/user-variables.html
and also see a good post here:MySQL: @variable vs. variable. Whats the difference?
edited May 23 '17 at 10:29
Community♦
11
answered Dec 19 '14 at 6:52
Suchit kumarSuchit kumar
10.8k31436
edited May 23 '17 at 10:29
Community♦
11
edited May 23 '17 at 10:29
Community♦
11
edited May 23 '17 at 10:29
Community♦
11
11
answered Dec 19 '14 at 6:52
Suchit kumarSuchit kumar
10.8k31436
answered Dec 19 '14 at 6:52
Suchit kumarSuchit kumar
10.8k31436
answered Dec 19 '14 at 6:52
Suchit kumarSuchit kumar
10.8k31436
10.8k31436
Thank you.what about the @ ?
– ashTon
Dec 19 '14 at 6:55
@ashTon @ sign to suggest user-defined variable.
– Suchit kumar
Dec 19 '14 at 6:58
add a comment |
Thank you.what about the @ ?
– ashTon
Dec 19 '14 at 6:55
@ashTon @ sign to suggest user-defined variable.
– Suchit kumar
Dec 19 '14 at 6:58
Thank you.what about the @ ?
– ashTon
Dec 19 '14 at 6:55
Thank you.what about the @ ?
– ashTon
Dec 19 '14 at 6:55
@ashTon @ sign to suggest user-defined variable.
– Suchit kumar
Dec 19 '14 at 6:58
@ashTon @ sign to suggest user-defined variable.
– Suchit kumar
Dec 19 '14 at 6:58
add a comment |
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:=is assignment operator.– Grijesh Chauhan
Dec 19 '14 at 6:53