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Size: a a a
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UPTATE table AS t1
SET t1.loc = (
SELECT loc
FROM table AS t2
WHERE t2.no = t1.no
OFFSET 1
) LIMIT 1
S
UPTATE table AS t1
SET t1.loc = (
SELECT loc
FROM table AS t2
WHERE t2.no = t1.no
OFFSET 1
) LIMIT 1
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IF(loc <> 0, IF(@st = 0 or loc <> @st, @st := loc, @st), @st) AS st
S
IF(loc <> 0, IF(@st = 0 or loc <> @st, @st := loc, @st), @st) AS st
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IZ
no | oper | loc
1 | AAA | 123
1 | BBB | 0
1 | CCC | 0
2 | AAA | 135
2 | BBB | 0
....
no | oper | loc
1 | AAA | 123
1 | BBB | 123
1 | CCC | 123
2 | AAA | 135
2 | BBB | 135
....
IZ