mysql - SQL Sum of different rows -

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hi need in making query sum different materials in one.

materialname quantity date
...................... 20 .... 1/1/2010
...................... 10 .... 1/2/2010
b ...................... 30 .... 1/2/2010
c ...................... 20 .... 1/3/2010

for example want sum material , b.

try this. add where clause filter a & b sum quantity per materialname

select materialname,        sum(quantity) sum_quantity   tablename  materialname in ( 'a', 'b' ) group  materialname

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