Loop through table records - mysql

Question

I have a table with a list of names in it as below
+----------+
| CLI_NAME |
+----------+
| A |
| B |
| C |
| D |
| E |
+----------+
I'd like to loop through this something like
for each value in CLI_NAME do
{
bla bla
}
For each value in the table CLI_NAMES, I'd like to loop through and execute the below.
The value selected from the table above needs to go in as a parameter to T_NAME such as T_NAME = "abc" in the query below
INSERT INTO TABLE_2(DATE, O_WT)
SELECT
F_DATE,
CASE
WHEN
SUM(
CASE
WHEN
F_NAME like 'ty%asd%'
THEN
F_PKEY
END
) = 1 THEN 1
WHEN
SUM(
CASE
WHEN
F_NAME like 'ty%asd%'
THEN
F_PKEY
END
) = 2 THEN 2
WHEN
SUM(
CASE
WHEN
F_NAME like 'ty%asd%'
THEN
F_PKEY
END
) BETWEEN 3 AND 5 THEN 3
WHEN
SUM(
CASE
WHEN
F_NAME like 'ty%asd%'
THEN
F_PKEY
END
) > 5 THEN 5
ELSE 0
END AS O_WT
FROM
TABLE_1
WHERE
F_NAME IN (
SELECT I_NAME from I_WD WHERE I_I_ID IN (
SELECT I_MAP_ID FROM T_T_MAP where T_MAP_ID = (
SELECT T_ID FROM TWD WHERE T_NAME = 'abc'
)
)
)
AND F_DATE between '2015-05-01' and '2015-06-01'
AND F_NAME LIKE 'ty%pr%'
GROUP BY F_DATE
How could I loop through & do this please?

Answer 1

If I understand correctly, you can do what you want using CROSS JOIN:
INSERT INTO TABLE_2(DATE, O_WT)
SELECT t1.F_DATE,
(CASE WHEN SUM(CASE WHEN t1.F_NAME like 'ty%asd%' THEN t1.F_PKEY END) = 1 THEN 1
WHEN SUM(CASE WHEN t1.F_NAME like 'ty%asd%' THEN t1.F_PKEY END) = 2 THEN 2
WHEN SUM(CASE WHEN t1.F_NAME like 'ty%asd%' THEN t1.F_PKEY END) BETWEEN 3 AND 5 THEN 3
WHEN SUM(CASE WHEN t1. F_NAME like 'ty%asd%' THEN t1.F_PKEY END) > 5 THEN 5
ELSE 0
END)
END AS O_WT
FROM TABLE_1 t1 CROSS JOIN
CLI_NAMES
WHERE t1.F_NAME IN (SELECT I_NAME
FROM I_WD
WHERE I_I_ID IN (SELECT I_MAP_ID
FROM T_T_MAP
WHERE T_MAP_ID = (SELECT T_ID
FROM TWD
WHERE T_NAME = 'abc'
)
)
) AND
t1.F_DATE between '2015-05-01' and '2015-06-01' AND
t1.F_NAME LIKE 'ty%pr%'
GROUP BY t1.F_DATE

Answer 2

So you want 'abc' in WHERE T_NAME = 'abc' replaced with the CLI_NAME?
Does this suffice:
select i_map_id from t_t_map where t_map_id in
(
select t_id from twd where t_name in (select cli_name from cli_names)
)
instead of
select i_map_id from t_t_map where t_map_id =
(
select t_id from twd where t_name = 'abc'
)
It would not quite be the same as a loop. E.g. if 'A' and 'B' lead to the same t_ids, then you'd get the inserts just once instead of twice.