I have a table called "customers" which looks like this:
ID | NAME | ADDRESS | ZIP
John | Peterson | Street 2 | 45738
Jan | 74383 | Street 4 | 74383
Eric | Stone | 74383 | 74383
Julia| Carry | Street 9 | 74383
I want to replace any occurrence of "74383" with "". I have about 1.5 Million rows. Is this doable?
Okay sorry that was my mistake, the number can be in any COLUMN! I updated it.
Assuming you mean in the zip column:
update customers
set zip = ''
where zip = '74383';
Note: you might prefer to set the value to NULL rather than the empty string (''), but your question explicitly suggests an empty string.
EDIT:
I would actually suggest that you use separate update statements for each column if you have indexes on them. The updates will be much faster.
Second, if you replace the value with NULL rather than '', you can use the logic:
update customers
set zip = NULLIF(zip, '74383'),
address = NULLIF(address, '74383'),
name = NULLIF(name, '74383')
where '74383' in (name, address, zip);
(You can actually replace this with an empty string using COALESCE(NULLIF(zip, '74383'), ''), but I prefer a CASE once the logic gets at all complicated.)
Reverse the IN operator to search the existence of '74383' value in all the columns then using case statement you can update the columns. Try this.
UPDATE customers
SET NAME = CASE WHEN NAME = '74383' THEN '' ELSE NAME END,
address = CASE WHEN address = '74383' THEN '' ELSE address END,
zip = CASE WHEN zip = '74383' THEN '' ELSE zip END
WHERE '74383' IN ( NAME, address, zip )
It is strange for me the requirement like this but, anyway, you can try this:
START TRANSACTION;
UPDATE customers
SET NAME = ''
WHERE NAME = '74383';
UPDATE customers
SET ADDRESS = ''
WHERE ADDRESS = '74383';
UPDATE customers
SET ZIP = ''
WHERE ZIP = '74383';
COMMIT;
Related
I have an issue with the new ISC DHCP, KEA, on the MySQL backend.
I want to store leases in my DB, it works but some info are not stored.
I obtain this kind of entry in my DB :
+------------+--------+-----------+----------------+---------------------+-----------+----------+----------+----------+
| address | hwaddr | client_id | valid_lifetime | expire | subnet_id | fqdn_fwd | fqdn_rev | hostname |
+------------+--------+-----------+----------------+---------------------+-----------+----------+----------+----------+
| 3232236052 | '° | NULL | 4000 | 2015-07-22 08:54:32 | 1 | 0 | 0 | │
+------------+--------+-----------+----------------+---------------------+-----------+----------+----------+----------+
The address field is the IP adress in decimal, I checked and it's the good one.
I didn't find how change the IP adress to IPv4 format and how store mac address in the hwaddr field in the KEA documentation.
If someone know how to do this I will be really grateful !
Thank you !
As per KEA documentation hwaddr field is VARBINARY. You should be able to see the value IP address and hwaddr using:
SELECT INET_NTOA(address), HEX(hwaddr), lease4.* FROM lease4;
I had a similar need to create KEA host reservations and populate the MAC and IP addresses as regular strings while still having the fields KEA uses updated automatically on an INSERT or UPDATE.
What I ended up doing is creating two new fields that would hold those string values ('hosts.dhcp_identifier_str' and 'hosts.ipv4_address_str'):
ALTER TABLE `hosts` ADD `dhcp_identifier_str` VARCHAR(12) NOT NULL AFTER `dhcp_identifier`;
ALTER TABLE `hosts` ADD `ipv4_address_str` VARCHAR(15) NULL DEFAULT NULL AFTER `ipv4_address`;
Then, I keep the corresponding fields that KEA uses ('hosts.dhcp_identifier' and 'hosts.ipv4_address') up to date by using BEFORE INSERT/UPDATE MySQL triggers:
DELIMITER //
DROP TRIGGER IF EXISTS `host_BINS`//
CREATE TRIGGER `host_BINS` BEFORE INSERT ON `hosts`
FOR EACH ROW BEGIN
IF (NEW.dhcp_identifier = '' AND NEW.dhcp_identifier_str != '') THEN
SET NEW.dhcp_identifier = UNHEX(UPPER(NEW.dhcp_identifier_str));
ELSEIF (NEW.dhcp_identifier_str = '' AND NEW.dhcp_identifier != '') THEN
SET NEW.dhcp_identifier_str = LOWER(HEX(NEW.dhcp_identifier));
END IF;
IF (NEW.ipv4_address IS NULL AND NEW.ipv4_address_str IS NOT NULL) THEN
SET NEW.ipv4_address = INET_ATON(NEW.ipv4_address_str);
ELSEIF (NEW.ipv4_address_str IS NULL AND NEW.ipv4_address IS NOT NULL) THEN
SET NEW.ipv4_address_str = CAST(INET_NTOA(NEW.ipv4_address) AS CHAR);
END IF;
END
//
DROP TRIGGER IF EXISTS `host_BUPD`//
CREATE TRIGGER `host_BUPD` BEFORE UPDATE ON `hosts`
FOR EACH ROW BEGIN
IF (NEW.dhcp_identifier_str != '' AND OLD.dhcp_identifier != UNHEX(UPPER(NEW.dhcp_identifier_str))) THEN
SET NEW.dhcp_identifier = UNHEX(UPPER(NEW.dhcp_identifier_str));
ELSEIF (NEW.dhcp_identifier != '' AND OLD.dhcp_identifier_str != LOWER(HEX(NEW.dhcp_identifier))) THEN
SET NEW.dhcp_identifier_str = LOWER(HEX(NEW.dhcp_identifier));
END IF;
IF (NEW.ipv4_address_str IS NOT NULL AND OLD.ipv4_address != INET_ATON(NEW.ipv4_address_str)) THEN
SET NEW.ipv4_address = INET_ATON(NEW.ipv4_address_str);
ELSEIF (NEW.ipv4_address IS NOT NULL AND OLD.ipv4_address_str != CAST(INET_NTOA(NEW.ipv4_address) AS CHAR)) THEN
SET NEW.ipv4_address_str = CAST(INET_NTOA(NEW.ipv4_address) AS CHAR);
END IF;
END
//
This works whether you INSERT/UPDATE an entry using the dhcp_identifier/ipv4_address or dhcp_identifier_str/ipv4_address_str pairs.
I'm sure you can use the same triggers for the 'lease4' table.
Hope that helps.
I am trying to update a MySQL database but only if a field has the value Approved.
If status is Approved then Date approved should update with the date.
Below is the code I am currently using but cannot get it to work. How to get it to work?
UPDATE my_table
SET `FieldValue`= IF(FieldName='status' AND FieldValue='Approved','".date('m/d/Y')."','')
WHERE `SubmissionId`=".$SubmissionId."
AND FieldName='Date Approved'
Sample Data
+--------+--------------+---------------+--------------+
| FormId | SubmissionId | FieldName | FieldValue |
+--------+--------------+---------------+--------------+
| 6 | 778 | status | Not Approved |
| 6 | 778 | Date Approved | |
+--------+--------------+---------------+--------------+
Use a CASE statement like below:
UPDATE my_table
SET `FieldValue` = CASE WHEN FieldName = 'status'
AND FieldValue='Approved' THEN date('m/d/Y') ELSE `FieldValue` END
WHERE `SubmissionId` = $SubmissionId;
But your query won't make sense; your FieldValue column looks like a string type column and you are trying store a date type data.
Something like this?
$db = JFactory::getDbo();
$query = $db->getQuery(true);
// Fields to update.
$fields = array(
$db->quoteName('FieldValue') . ' = ' . $date->toSql('m/d/Y'))
);
// Conditions for which records should be updated.
$conditions = array(
$db->quoteName('SubmissionId') . ' = SubmissionId',
$db->quoteName('FieldValue') . ' = ' . $db->quote('Approved')
);
$query->update($db->quoteName('#__my_table'))->set($fields)->where($conditions);
$db->setQuery($query);
$result = $db->execute();
Superficially, you should be using the raw SQL like this:
UPDATE my_table
SET FieldValue = date('m/d/Y')
WHERE SubmissionId = 778
AND FieldName = 'Date Approved'
-- AND FieldValue IS NULL -- Optional
-- AND FormId = 6 -- Optional
AND EXISTS (SELECT * FROM my_table
WHERE FieldName = 'status'
AND FieldValue = 'Approved'
AND SubmissionId = 778
-- AND FormId = 6 -- Optional
)
You might need to tart things up a little to get values embedded into the string that forms the SQL statement.
You don't mention FormID in your query; in case of doubt, you should constrain the UPDATE with the correct FormID value, twice, like you constrain the SubmissionID value twice (as shown in the comments). You might decide you only want to update the 'Date Approved' field name when it is NULL (or perhaps blank).
I note that one of the problem with this EAV design is that you lose the type-checking that a normal design gives you. You could store a date (as intended), or a pure number, or pure text, or anything else in the FieldValue column for the 'Date Approved' FieldName and there's nothing to stop that abuse happening. If you had an orthodox typed column, you could ensure that non-dates were never stored in the 'Date Approved' column.
Your UPDATE is tied to a single submission ID; so is mine. It should be possible to enhance things so that all the uninitialized 'Date Approved' columns that are approved and have not previously had the 'Date Approved' value set do in fact have it set.
I am trying to update my table 'supplier_stats' with the values from my other table 'supplier_change_request'.
My two tables look like the following:
Supplier_change_request
id | user_id | company_name | supplier_number
1 123 hewden V0001
Supplier_stats
Id | user_id | company_name | address | reference | supplier_number
1 123 pie n/a 12345 V0001
2 145 gates n/a 12345 V0002
Here is my MySQL:
$reference = '12345'
$query = "UPDATE supplier_stats
SET supplier_stats.company_name = (
SELECT supplier_change_request.company_name
FROM supplier_change_request
WHERE supplier_change_request.reference = '$reference' AND supplier_change_request.supplier_number = supplier_stats.supplier_number";
mysql_select_db('hewden1');
$retval = mysql_query( $query, $conn )
by my calculation this should be setting the value of company_name where supplier_number is 'V0001' in my table 'supplier_stats' to 'hewden'. However the company_name is not being updated.
Can someone please show me where I am going wrong? Thank you in advance
I think the syntax is a bit off in your query and that it should look like this (just the SQL, adapt to PHP as needed):
UPDATE supplier_stats ss
JOIN supplier_change_request scr ON scr.supplier_number = ss.supplier_number
SET ss.company_name = scr.company_name
WHERE ss.reference = '$reference'
The column reference pointed to the supplier_change_request in your sample query, but to supplier_stats in your sample data - I assumed the sample data was correct; change if not.
This query should change the company_name in supplier_stats from pie to hewden.
I'm trying to make my first function, it creates without any error, but, when I try to use it it gives me error.
Here's the function -
CREATE FUNCTION isie_kontakti (condition CHAR(3))
RETURNS CHAR(100)
BEGIN
DECLARE returnthis CHAR(100);
SELECT DISTINCT Person.name, Person.lastName, Contacts.mobile, Contacts.email
FROM Person JOIN Contacts on Contacts.Person_ID = Person.ID
JOIN ParentChild on ParentChild.parentID = Person.ID
JOIN ChildGroup ON ChildGroup.Person_ID = ParentChild.childID
WHERE ChildGroup.Group_ID = 'condition' INTO returnthis;
RETURN returnthis;
END//
Table schema - http://www.imagesup.net/dm-713886347846.png
You create your function to return a single column of type char(100) yet the returnthis item contains quite a few columns.
You need to match up your query and return type.
How you do that depends on what you're trying to achieve. It's possibly as simple as just concatenating the columns from the select into a single variable, something along the lines of (untested since I don't have my DBMS available at the moment):
SELECT Person.name | ' '
| Person.lastName | ' '
| Contacts.mobile | ' '
| Contacts.email
FROM ...
I recently recoded one of my sites, and the database structure is a little bit different.
I'm trying to convert the following:
*----*----------------------------*
| id | file_name |
*----*----------------------------*
| 1 | 1288044935741310953434.jpg |
*----*----------------------------*
| 2 | 1288044935741310352357.rar |
*----*----------------------------*
Into the following:
*----*----------------------------*
| id | file_name |
*----*----------------------------*
| 1 | 1288044935741310953434 |
*----*----------------------------*
| 2 | 1288044935741310352357 |
*----*----------------------------*
I know that I could do a foreach loop with PHP, and explode the file extension off the end, and update each row that way, but that seems like way too many queries for the task.
Is there any SQL query that I could run that would allow me to remove the file exentision from each field in the file_name column?
You can use the REPLACE() function in native MySQL to do a simple string replacement.
UPDATE tbl SET file_name = REPLACE(file_name, '.jpg', '');
UPDATE tbl SET file_name = REPLACE(file_name, '.rar', '');
This should work:
UPDATE MyTable
SET file_name = SUBSTRING(file_name,1, CHAR_LENGTH(file_name)-4)
This will strip off the final extension, if any, from file_name each time it is run. It is agnostic with respect to extension (so you can have ".foo" some day) and won't harm extensionless records.
UPDATE tbl
SET file_name = TRIM(TRAILING CONCAT('.', SUBSTRING_INDEX(file_name, '.', -1) FROM file_name);
You can use SUBSTRING_INDEX function
SUBSTRING_INDEX(str,delim,count)
Where str is the string, delim is the delimiter (from which you want a substring to the left or right of), and count specifies which delimiter (in the event there are multiple occurrences of the delimiter in the string)
Example:
UPDATE table SET file_name = SUBSTRING_INDEX(file_name , '.' , 1);