I have a table that has around 1 million rows. The data in one of the columns is like this:
Table1
col1
2034/5402/1234
123/456/789/456/
786/324/654/
I want to append /6789 in each row. How can I achieve that?
Related
I have created a new column in the "destination" table with the same name, datatype and other values as appear in the "source" column in a different table. I have tried many suggested solutions as found on stackoverflow. This one appeared to work (found on Quora) but when I went to the destination table the previously empty column remains empty with nothing but NULL values noted. This is the Quora suggestion:
you can fill data in column from another existing one by using INSERT INTO statement and SELECT statement together like that
INSERT INTO `table1`(column_name)
SELECT column_name FROM `table2`
here you filled a single column in table 1 with data located in a single column in table 2
so if you want to fill the whole table 1 (all columns) with data located in table 2 you can make table 1 like a copy of table 2 by using the same code but without column name
INSERT INTO `table1`
SELECT * FROM `table2`
but note to do this (copy table content to another one) ensure that both of tables have the same column count and data types.
I'm not sure what is meant by column count (do the two table have to have the same number of columns?)
When I run it I get error # 1138.
Any help greatly appreciated. -JG
i have two tables, with same columns. but there are duplicates. i want to create third one but without duplicate rows. what is the best way to do this keeping in mind that tables have over million records?
Table have two columns, ean and price
If both the tables have same structure then , I think you should try union.
Sample Query--
Assuming 2 table from which the data needs to be retrieved as
table_src_1
table_src_2
Final Table-table_unique_records
Your Query-
create table table_unique_records as
(select * from table_src_1
union
select * from table_src_2)
I'm trying to insert rows using the same last values of rows in the column name bill period.
this is my desired result, and after the billperiod 3 it goes into 4 taking the data rows of billperiod 3.
I tried other solution where I used the other table to use it as a where but this are the results.
but It didn't work, here is the image of my other table
I have a table with several columns Table1(Col A, Col B)
Now I have one more table with one column. Table2 (Col C)
What I want to do is:
Replace Col B of table1 with Col C of tabl 2.
Is it possible in SQL? I am using phpmyadmin to execute queries
Why I need to do this?
- I was playing around with the database structure and changed the type of text to integer which messed up the entries in the column
- Good thing: I have a backup excel file so now i am planning to replace the effected column to by the orginal values in the backedup excel file.
No can do.
You seem to be making an incorrect assumption, namely that the order of rows in a table is significant. Else what's confusing some of the commenters would be clear to you: there's no information in table2 to relate it to table1.
Since you still have the data in Excel, drop table2 and re-create it with rows having the key to table1. Then write a view to join them. Easiest is probably to insert that join result into a third table, and then drop the first two and rename the third.
I've been trying to figure this out, but can't seem to come up with a simple solution.
Say for instance I have a table that has similar data throughout 3 columns (i.e. different types of activities spanning 3 columns) but I want to have those three columns inserted into a separate table (Table2) so I can keep the like data together and perform a JOIN to match it with its respective data in Table1.
I'm not talking about performing a CONCAT or CONCAT_WS, but moving those three columns from Table1 into one column in Table2, each item with its own row.
Is there a way to do this through a query without having to manually insert each entry into Table2?
Thank you in advance!
It might be as simple as:
insert into table2
(field)
select column1 from table1
union
select column2 from table1
union
select column3 from table1
But, before you do this, decide what you want to do if two columns in table1 have the same value.