sql declare variable
-- Declare the variable to be used.
DECLARE @MyCounter int;
-- Initialize the variable.
SET @MyCounter = 0;
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1
DECLARE @COURSE_ID AS INT, @COURSE_NAME VARCHAR (10);
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(1 Votes)
0
4
3
DECLARE { @LOCAL_VARIABLE[AS] data_type [ = value ] }
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3
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(3 Votes)
0
3.6
5
One way of doing this is to use database variables
create table testcalc (
id int(11) not null auto_increment,
num1 int(11) default null,
num2 int(11) default null,
num3 int(11) default null,
num4 int(11) default null,
primary key(id)
);
insert into testcalc values
(default, 1, 2, 3, 4),
(default, 5, 10, 15, 20);
Then you can get the same results as in your example by storing the calculation results in variable syntax like this
@youVar := (calc) as resultName01
Then it will be available to following calculations to use like this
(@youVar + newCalc) as resultName02
We can apply it to your example like this
select
id,
num1,
num2,
num3,
num4,
@1plus2 := (num1 + num2) as 1plus2, # create var01
@1plus2mult3 := (@1plus2 * num3) as 1plus2mult3, # create var02 using var01
@sumOfCalc := (@1plus2 + @1plus2mult3) as sumOfCalc # create var03 using var01 and var02
from testcalc;
Thank you!
5
3.6
(5 Votes)
0
3.4
10
DECLARE @TABLE TABLE( COL1 INT, COL2 VARCHAR(30))
Thank you!
10
3.4
(10 Votes)
0
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