mysql - Calculate Percentage from two different table -


i have 2 tables, , want percentage value , update percentage table. suppose have 2 table this,

table 1

   date     open   high   low   close   stock_id 2013-01-02   10     20     5     15        1 2013-01-02   150    200   100    170       2 2013-01-03   15     30     10    20        1

table 2

   date     p_high  p_low   percent   stock_id 2013-01-02   25     10       0.00        1 2013-01-02   210    120      0.00        2 2013-01-03   40     20       0.00        1

i want calculate percentage using formula

(p_high - high) / high

percentage stock_id = 1 in date = 2013-01-02 this.

(25 - 20) / 20 = 25.00

when percentage, want update table 2 this,

  date      p_high   p_low   percent   stock_id 2013-01-02    25      10      25.00       1

how can in mysql?

thank help.

ddl

create table table1(     created_dt date,     open decimal(5,2),     high decimal(5,2),     low decimal(5,2),     close decimal(5,2),     stock_id integer );  create table table2(     created_dt date,     p_high decimal(5,2),     p_low decimal(5,2),     percent decimal(5,2),     stock_id integer );

dml 

insert table1 values ('2013-01-02',10,20,5,15,1); insert table1 values ('2013-01-02',150,200,100,170,2); insert table1 values ('2013-01-03',15,30,10,20,1);  insert table2 values('2013-01-02',25,10,0.00,1); insert table2 values('2013-01-02',210,120,0.00,2); insert table2 values('2013-01-02',40,20,0.00,1);  update table2 join table1 on table1.created_dt = table2.created_dt , table1.stock_id = table2.stock_id set percent = ((p_high - high)/high);

working example http://sqlfiddle.com/#!2/21d02/1/0


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