mysql - Summing-up For an Arbitrary List of Rows -

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i wish write this:

select sum(weight) items itemid in (4217,4575,6549,4217)

where itemid primary key, , sqlite , mysql process expected, i.e. add 4217-th row sum twice, don't.

is there @ least in mysql i'm not aware of that's intended cases this? if not, workaround like? row can have number of duplicates in list. list can big although in cases small.

i don't know out of box functionality can this. here workaroud. can insert values temp table , use join:

create temporary table list(id int); insert list(id) values(4217),(4575),(6549),(4217);  select sum(i.weight)  items join list l on i.itemid = l.id;

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