MySQL function to to evaluate a string as integer based on array of data
I have the following SQL query:
UPDATE my_records, units
SET my_records.unit_id = units.id
WHERE my_records.column_1 = units.column_1 AND my_records.column_2 = units.column_2
AND my_records.id > 0 AND my_records.id <= 1000
ORDER BY my_records.id
The problem is my_records.column_1 is an integer and units.column_1 is a string. But they reference the same array of data:
[ 'Medical', 'Legal', 'Auto', 'Electrical', 'Software', 'Education' ]
So my_records.column_1 can be 0 and units.column_1 can be 'Medical'. But I can discern that 'Medical' is 0 because it is the first element of the array.
Is there a function I can pass to MySQL to convert that string of 'Medical' to the appropriate index like 0?
mysql sql database
edited Nov 15 '18 at 1:52
kit
1,1063716
asked Nov 15 '18 at 0:34
DonatoDonato
1,92431229
add a comment |
I have the following SQL query:
UPDATE my_records, units
SET my_records.unit_id = units.id
WHERE my_records.column_1 = units.column_1 AND my_records.column_2 = units.column_2
AND my_records.id > 0 AND my_records.id <= 1000
ORDER BY my_records.id
The problem is my_records.column_1 is an integer and units.column_1 is a string. But they reference the same array of data:
[ 'Medical', 'Legal', 'Auto', 'Electrical', 'Software', 'Education' ]
So my_records.column_1 can be 0 and units.column_1 can be 'Medical'. But I can discern that 'Medical' is 0 because it is the first element of the array.
Is there a function I can pass to MySQL to convert that string of 'Medical' to the appropriate index like 0?
mysql sql database
edited Nov 15 '18 at 1:52
kit
1,1063716
asked Nov 15 '18 at 0:34
DonatoDonato
1,92431229
add a comment |
I have the following SQL query:
UPDATE my_records, units
SET my_records.unit_id = units.id
WHERE my_records.column_1 = units.column_1 AND my_records.column_2 = units.column_2
AND my_records.id > 0 AND my_records.id <= 1000
ORDER BY my_records.id
The problem is my_records.column_1 is an integer and units.column_1 is a string. But they reference the same array of data:
[ 'Medical', 'Legal', 'Auto', 'Electrical', 'Software', 'Education' ]
So my_records.column_1 can be 0 and units.column_1 can be 'Medical'. But I can discern that 'Medical' is 0 because it is the first element of the array.
Is there a function I can pass to MySQL to convert that string of 'Medical' to the appropriate index like 0?
mysql sql database
edited Nov 15 '18 at 1:52
kit
1,1063716
asked Nov 15 '18 at 0:34
DonatoDonato
1,92431229
I have the following SQL query:
UPDATE my_records, units
SET my_records.unit_id = units.id
WHERE my_records.column_1 = units.column_1 AND my_records.column_2 = units.column_2
AND my_records.id > 0 AND my_records.id <= 1000
ORDER BY my_records.id
The problem is my_records.column_1 is an integer and units.column_1 is a string. But they reference the same array of data:
[ 'Medical', 'Legal', 'Auto', 'Electrical', 'Software', 'Education' ]
So my_records.column_1 can be 0 and units.column_1 can be 'Medical'. But I can discern that 'Medical' is 0 because it is the first element of the array.
Is there a function I can pass to MySQL to convert that string of 'Medical' to the appropriate index like 0?
mysql sql database
mysql sql database
edited Nov 15 '18 at 1:52
kit
1,1063716
asked Nov 15 '18 at 0:34
DonatoDonato
1,92431229
edited Nov 15 '18 at 1:52
kit
1,1063716
asked Nov 15 '18 at 0:34
DonatoDonato
1,92431229
edited Nov 15 '18 at 1:52
kit
1,1063716
edited Nov 15 '18 at 1:52
kit
1,1063716
edited Nov 15 '18 at 1:52
kit
1,1063716
1,1063716
asked Nov 15 '18 at 0:34
DonatoDonato
1,92431229
asked Nov 15 '18 at 0:34
DonatoDonato
1,92431229
asked Nov 15 '18 at 0:34
DonatoDonato
1,92431229
1,92431229
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
Write the query using JOIN and table aliases
UPDATE my_records r JOIN
units u
ON r.column_1 = u.column_1 AND r.column_2 = u.column_2
SET r.unit_id = u.id
WHERE r.id > 0 AND r.id <= 1000
ORDER BY my_records.id;
Now, you want to do the conversion. Probably the simplest method is a function such as FIELD():
UPDATE my_records r JOIN
units u
ON r.column_1 = FIELD(u.column_1, 'Medical', 'Legal', 'Auto', 'Electrical', 'Software', 'Education') AND
r.column_2 = u.column_2
SET r.unit_id = u.id
WHERE r.id > 0 AND r.id <= 1000
ORDER BY my_records.id;
Note: You might need to adjust the value returned by FIELD() because it is 1-based.
That said, you have a problem with your data model if you are storing values like this with no reference table. You really should be joining to a reference table to disambiguate the codes.
answered Nov 15 '18 at 0:39
Gordon LinoffGordon Linoff
760k35294399
Because this is 1-based index, I should add "- 1" to the query right? Like this: ON r. column_1 = FIELD(u.column_1, 'Medical', 'Legal', 'Auto', 'Electrical', 'Software', 'Education') - 1
– Donato
Nov 15 '18 at 1:03
@Donato . . . Ifu.column_1is zero-based, then you should subtract 1.
– Gordon Linoff
Nov 15 '18 at 2:02
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
Write the query using JOIN and table aliases
UPDATE my_records r JOIN
units u
ON r.column_1 = u.column_1 AND r.column_2 = u.column_2
SET r.unit_id = u.id
WHERE r.id > 0 AND r.id <= 1000
ORDER BY my_records.id;
Now, you want to do the conversion. Probably the simplest method is a function such as FIELD():
UPDATE my_records r JOIN
units u
ON r.column_1 = FIELD(u.column_1, 'Medical', 'Legal', 'Auto', 'Electrical', 'Software', 'Education') AND
r.column_2 = u.column_2
SET r.unit_id = u.id
WHERE r.id > 0 AND r.id <= 1000
ORDER BY my_records.id;
Note: You might need to adjust the value returned by FIELD() because it is 1-based.
That said, you have a problem with your data model if you are storing values like this with no reference table. You really should be joining to a reference table to disambiguate the codes.
answered Nov 15 '18 at 0:39
Gordon LinoffGordon Linoff
760k35294399
Because this is 1-based index, I should add "- 1" to the query right? Like this: ON r. column_1 = FIELD(u.column_1, 'Medical', 'Legal', 'Auto', 'Electrical', 'Software', 'Education') - 1
– Donato
Nov 15 '18 at 1:03
@Donato . . . Ifu.column_1is zero-based, then you should subtract 1.
– Gordon Linoff
Nov 15 '18 at 2:02
add a comment |
Write the query using JOIN and table aliases
UPDATE my_records r JOIN
units u
ON r.column_1 = u.column_1 AND r.column_2 = u.column_2
SET r.unit_id = u.id
WHERE r.id > 0 AND r.id <= 1000
ORDER BY my_records.id;
Now, you want to do the conversion. Probably the simplest method is a function such as FIELD():
UPDATE my_records r JOIN
units u
ON r.column_1 = FIELD(u.column_1, 'Medical', 'Legal', 'Auto', 'Electrical', 'Software', 'Education') AND
r.column_2 = u.column_2
SET r.unit_id = u.id
WHERE r.id > 0 AND r.id <= 1000
ORDER BY my_records.id;
Note: You might need to adjust the value returned by FIELD() because it is 1-based.
That said, you have a problem with your data model if you are storing values like this with no reference table. You really should be joining to a reference table to disambiguate the codes.
answered Nov 15 '18 at 0:39
Gordon LinoffGordon Linoff
760k35294399
Because this is 1-based index, I should add "- 1" to the query right? Like this: ON r. column_1 = FIELD(u.column_1, 'Medical', 'Legal', 'Auto', 'Electrical', 'Software', 'Education') - 1
– Donato
Nov 15 '18 at 1:03
@Donato . . . Ifu.column_1is zero-based, then you should subtract 1.
– Gordon Linoff
Nov 15 '18 at 2:02
add a comment |
Write the query using JOIN and table aliases
UPDATE my_records r JOIN
units u
ON r.column_1 = u.column_1 AND r.column_2 = u.column_2
SET r.unit_id = u.id
WHERE r.id > 0 AND r.id <= 1000
ORDER BY my_records.id;
Now, you want to do the conversion. Probably the simplest method is a function such as FIELD():
UPDATE my_records r JOIN
units u
ON r.column_1 = FIELD(u.column_1, 'Medical', 'Legal', 'Auto', 'Electrical', 'Software', 'Education') AND
r.column_2 = u.column_2
SET r.unit_id = u.id
WHERE r.id > 0 AND r.id <= 1000
ORDER BY my_records.id;
Note: You might need to adjust the value returned by FIELD() because it is 1-based.
That said, you have a problem with your data model if you are storing values like this with no reference table. You really should be joining to a reference table to disambiguate the codes.
answered Nov 15 '18 at 0:39
Gordon LinoffGordon Linoff
760k35294399
Write the query using JOIN and table aliases
UPDATE my_records r JOIN
units u
ON r.column_1 = u.column_1 AND r.column_2 = u.column_2
SET r.unit_id = u.id
WHERE r.id > 0 AND r.id <= 1000
ORDER BY my_records.id;
Now, you want to do the conversion. Probably the simplest method is a function such as FIELD():
UPDATE my_records r JOIN
units u
ON r.column_1 = FIELD(u.column_1, 'Medical', 'Legal', 'Auto', 'Electrical', 'Software', 'Education') AND
r.column_2 = u.column_2
SET r.unit_id = u.id
WHERE r.id > 0 AND r.id <= 1000
ORDER BY my_records.id;
Note: You might need to adjust the value returned by FIELD() because it is 1-based.
That said, you have a problem with your data model if you are storing values like this with no reference table. You really should be joining to a reference table to disambiguate the codes.
answered Nov 15 '18 at 0:39
Gordon LinoffGordon Linoff
760k35294399
edited Nov 15 '18 at 0:46
answered Nov 15 '18 at 0:39
Gordon LinoffGordon Linoff
760k35294399
answered Nov 15 '18 at 0:39
Gordon LinoffGordon Linoff
760k35294399
answered Nov 15 '18 at 0:39
Gordon LinoffGordon Linoff
760k35294399
760k35294399
Because this is 1-based index, I should add "- 1" to the query right? Like this: ON r. column_1 = FIELD(u.column_1, 'Medical', 'Legal', 'Auto', 'Electrical', 'Software', 'Education') - 1
– Donato
Nov 15 '18 at 1:03
@Donato . . . Ifu.column_1is zero-based, then you should subtract 1.
– Gordon Linoff
Nov 15 '18 at 2:02
add a comment |
Because this is 1-based index, I should add "- 1" to the query right? Like this: ON r. column_1 = FIELD(u.column_1, 'Medical', 'Legal', 'Auto', 'Electrical', 'Software', 'Education') - 1
– Donato
Nov 15 '18 at 1:03
@Donato . . . Ifu.column_1is zero-based, then you should subtract 1.
– Gordon Linoff
Nov 15 '18 at 2:02
Because this is 1-based index, I should add "- 1" to the query right? Like this: ON r. column_1 = FIELD(u.column_1, 'Medical', 'Legal', 'Auto', 'Electrical', 'Software', 'Education') - 1
– Donato
Nov 15 '18 at 1:03
Because this is 1-based index, I should add "- 1" to the query right? Like this: ON r. column_1 = FIELD(u.column_1, 'Medical', 'Legal', 'Auto', 'Electrical', 'Software', 'Education') - 1
– Donato
Nov 15 '18 at 1:03
@Donato . . . If
u.column_1 is zero-based, then you should subtract 1.– Gordon Linoff
Nov 15 '18 at 2:02
@Donato . . . If
u.column_1 is zero-based, then you should subtract 1.– Gordon Linoff
Nov 15 '18 at 2:02
add a comment |
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