I am trying to find the correct SQL query to UPDATE fields from a table that contain at least some text. My idea is something like this.
UPDATE this IN tablename WHERE fieldname = "%value%"
I know something is wrong but I am new to this and in need of some help. Thanks
INSERT statement will add new row(s) into your table.
The UPDATE statement will edit your current row(s).
You should at least shout if you want some help.
Please post something more for your question, like table name, column names and your exact requirement.
UPDATE statement is something like this:
UPDATE tablename SET field1 = 'TEST' WHERE fieldname LIKE "%value%";
Related
I have ONE column in MySQl table which contains this format:
https://open.spotify.com/track/AAABBBCCC
and I'd like to leave just AAABBBCCC, and not the entire column! The last parte is always the same.
Is that possible? Thanks and sorry for my english!
You can use SQL REPLACE function to do that.
UPDATE your_table_name
SET your_column_name = REPLACE(your_column_name, 'https://open.spotify.com/track/', '')
For more information you can read SQL statement to remove part of a string
Use REPLACE to delete the wanted text from your column:
UPDATE Table1 SET Column1 = REPLACE(Column1,'https://open.spotify.com/track/','')
I need to update one column if another column has a specific data.
Usually if I want to update one column, I do the following SQL Query:
UPDATE table1
SET field1 = replace(field1, 'oldstring', 'newstring')
But what I can't figure is how to make it look up one column, and if that field has some data, it should update another column's field.
Here is what I want to do.
look in table: phpbb_tree
under column: spouses_total
if the field is empty (has no data)
update column: page_template
update from: tree_body_spouse_1.html to: tree_body_single.html
So basically, I know how to do the "update" part, but don't know how to make it look first in one column, and if empty (or matches) it should do the following:
UPDATE phpbb_tree
SET page_template = replace(page_template, 'tree_body_spouse_1.html', 'tree_body_single.html')
Hopefully someone could tell me how to write it up. I don't even know if it's even possible to do a search for an empty data in a column?
You could use CASE expression to fulfill different condition of replacement.
UPDATE phpbb_tree
SET page_template = (CASE
WHEN spouses_total is null
THEN replace(page_template, 'tree_body_spouse_1.html', 'tree_body_single.html')
ELSE page_template
END
);
Edit:
Please check this..
SQL Fiddle HERE
I am trying to use an update query to update fields from one table to another for fields but only if the fields in the table that i am updating into is blank. If they contain information, I do not want to overwrite the existing data
e.g
Field: Name
Table: Table 1
Update to: [Table2.][Name]
Criteria:
I am unsure of what to put in the criteria. I tried, 'Is Null', Like "".
Here is an example:
UPDATE MyTable SET MyTable.FieldB = "MyNewValue" WHERE (((MyTable.FieldB) Is Null));
Looking at the Query from within Access, you can switch to SQL view. You just need to put Is Null in the criteria column: UPDATE MyTable SET MyTable.FieldB = "MyNewValue" WHERE (((MyTable.FieldB) Is Null));
Furthermore, you can just write Is Null on alternate lines and it will count as OR.
In my table "accounts" I have four columns like
user, pass, column1, column2
I need to insert value into column2, where user='special_user_value'.
How can I do this?
UPDATE accounts
SET column2 = 'New Value'
WHERE user = 'special_user_value';
You don't "insert values" into a column. You insert a row, that has a value for all the columns you specified in the table creation; Just like a real table, or excel sheet for that matter.
If you need to change a column value for a specific row, you can use UPDATE:
UPDATE table_name SET column2='new value' WHERE user='special_user_value'
This is a really basic example. If you follow the link I provided for UPDATE, you may learn more about changing table values for a specific row.
If are you looking for actually inserting a new row with a specific value for that column, there's INSERT INTO you could follow to achieve that.
Use update Query like:
Update table_nm set field1=value1, Field2=value2 Where condition;
UPDATE Accounts SET column2='NewValue' WHERE user='special_user_value'
I am currently using MySQL. I have a table that has an auto_increment 'id' field, and an 'imgname' field containing a string that is the file name of an image.
I need to generate the 'imgname' value using the auto_increment value that is create by an INSERT INTO statement. The problem is, I don't know this value until I can use mysql_insert_id, AFTER the insert query has run. I would like to know if it's possible to access this value DURING the insert query somehow and then use it to generate my string in the query statement.
Thanks in advance.
I would keep the id and imgname independent of each other and combine the two on SELECT when needed. If the need is frequent enough, create a view.
Have a look at LAST_INSERT_ID() function. If performance is not an issue, INSERT regularly, and then UPDATE using LAST_INSERT_ID(), like:
UPDATE table SET name = CONCAT(name, "-", LAST_INSERT_ID()) WHERE id = LAST_INSERT_ID();