MySql union Sum(Case()) - mysql

Question

How can I do a "union" in order to get only distinct values for "ACTIVITY" field, but with the variables started by "OUTPUT_" from "OUTPUT_TAB" appearing in the header. (Like "INPUT_" variables from "INPUT_TAB") .
It's possible ? I can not do it.
Check my Query PIC_QUERY:
SELECT
ACTIVIDADE,
SUM(CASE WHEN DATA_VAL_REGISTO = '2017-06-25' THEN 1 ELSE 0 END) INPUT_ACT_DATE_VOL,
SUM(CASE WHEN DATA_VAL_REGISTO = '2017-06-24' THEN 1 ELSE 0 END) PREV_DATE_VOL,
SUM(CASE WHEN WEEK(DATA_VAL_REGISTO,7) = '25' AND YEAR(DATA_VAL_REGISTO) = '2017' THEN 1 ELSE 0 END) INPUT_ACT_WEEK_VOL,
SUM(CASE WHEN WEEK(DATA_VAL_REGISTO,7) = '24' AND YEAR(DATA_VAL_REGISTO) = '2017' THEN 1 ELSE 0 END) INPUT_PREV_WEEK_VOL,
SUM(CASE WHEN MONTH(DATA_VAL_REGISTO) = '6' AND YEAR(DATA_VAL_REGISTO) = '2017' THEN 1 ELSE 0 END) INPUT_ACT_MONTH_VOL,
SUM(CASE WHEN MONTH(DATA_VAL_REGISTO) = '5' AND YEAR(DATA_VAL_REGISTO) = '2017' THEN 1 ELSE 0 END) INPUT_PREV_MONTH_VOL
FROM INPUT_TAB
GROUP BY ACTIVIDADE
UNION
SELECT
ACTIVIDADE,
SUM(CASE WHEN DATA_FIM_REP = '2017-06-25' THEN 1 ELSE 0 END) OUTPUT_ACT_DATE_VOL,
SUM(CASE WHEN DATA_FIM_REP = '2017-06-24' THEN 1 ELSE 0 END) OUTPUT_PREV_DATE_VOL,
SUM(CASE WHEN WEEK(DATA_FIM_REP,7) = '25' AND YEAR(DATA_FIM_REP) = '2017' THEN 1 ELSE 0 END) OUTPUT_ACT_WEEK_VOL,
SUM(CASE WHEN WEEK(DATA_FIM_REP,7) = '24' AND YEAR(DATA_FIM_REP) = '2017' THEN 1 ELSE 0 END) OUTPUT_PREV_WEEK_VOL,
SUM(CASE WHEN MONTH(DATA_FIM_REP) = '6' AND YEAR(DATA_FIM_REP) = '2017' THEN 1 ELSE 0 END) OUTPUT_ACT_MONTH_VOL,
SUM(CASE WHEN MONTH(DATA_FIM_REP) = '5' AND YEAR(DATA_FIM_REP) = '2017' THEN 1 ELSE 0 END) OUTPUT_PREV_MONTH_VOL
FROM OUTPUT_TAB
GROUP BY ACTIVIDADE
RESULT: PIC_RESULT

Answer 1

You don't want a union of two query results, but a join:
SELECT
actividade,
i.input_act_date_vol, i.input_prev_date_vol, i.input_act_week_vol,
i.input_prev_week_vol, i.input_act_month_vol, i.input_prev_month_vol,
o.output_act_date_vol, o.output_prev_date_vol, o.output_act_week_vol,
o.output_prev_week_vol, o.output_act_month_vol, o.output_prev_month_vol
FROM
(
SELECT
actividade,
SUM(data_val_registo = '2017-06-25') AS input_act_date_vol,
SUM(data_val_registo = '2017-06-24') AS input_prev_date_vol,
SUM(WEEK(data_val_registo, 7) = 25 AND YEAR(data_val_registo) = 2017) AS input_act_week_vol,
SUM(WEEK(data_val_registo, 7) = 24 AND YEAR(data_val_registo) = 2017) AS input_prev_week_vol,
SUM(MONTH(data_val_registo) = 6 AND YEAR(data_val_registo) = 2017) AS input_act_month_vol,
SUM(MONTH(data_val_registo) = 5 AND YEAR(data_val_registo) = 2017) AS input_prev_month_vol
FROM input_tab
GROUP BY actividade
) i
JOIN
(
SELECT
actividade,
SUM(data_fim_rep = '2017-06-25') AS output_act_date_vol,
SUM(data_fim_rep = '2017-06-24') AS output_prev_date_vol,
SUM(WEEK(data_fim_rep, 7) = 25 AND YEAR(data_fim_rep) = 2017) AS output_act_week_vol,
SUM(WEEK(data_fim_rep, 7) = 24 AND YEAR(data_fim_rep) = 2017) AS output_prev_week_vol,
SUM(MONTH(data_fim_rep) = 6 AND YEAR(data_fim_rep) = 2017) AS output_act_month_vol,
SUM(MONTH(data_fim_rep) = 5 AND YEAR(data_fim_rep) = 2017) ASoutput_prev_month_vol
FROM OUTPUT_TAB
GROUP BY actividade
) o USING (actividade);
In case there can be input without output or vice versa, you'll have to use an outer join instead. In case there can even be both, input without output and output without input, you'll have to look up how to emulate a full outer join in MySQL.
I've removed CASE WHEN .. THEN 1 ELSE 0 END, because a boolean expression results in true or false which equal to 1 and 0 in MySQL.
BTW: As this is all about 2017, you can get your queries simpler and faster by using WHERE YEAR(data_val_registo) and WHERE YEAR(data_fim_rep) = 2017 and removing the condition from the sum expressions.