as picture(phpmyadmin),I have tables in the database week1 the tables are now empty.
I have another databases with exactly the same sql schema w1moninside and w1monoutside
but they have values.
I want to union these two and insert them in week1
what should I do?
I inserted the picture just for clearance.unoin for one of the tables for example the first one, data
is enough for me
Thanks.
mysql> describe w1moninside.data;
+--------------+------------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+--------------+------------------+------+-----+---------+-------+
| sid | int(10) unsigned | NO | PRI | NULL | |
| cid | int(10) unsigned | NO | PRI | NULL | |
| data_payload | text | YES | | NULL | |
+--------------+------------------+------+-----+---------+-------+
3 rows in set (0.01 sec)
Insert into week1.TableName (column list)
select column list from w1moninside.TableName where...
union
select column list from w1monoutside.TableName where
Insert into week1 (column list)
select column list from dbname.w1moninside where...
union
select column list from dbname.w1monoutside where..
Related
I've read MySQL - UPDATE query based on SELECT Query and am trying to do something similar - i.e. run an UPDATE query on a table and populate it with the results from a SELECT.
In my case the table I want to update is called substances and has a column called cas_html which is supposed to store CAS Numbers (chemical codes) as a HTML string.
Due to the structure of the database I am running the following query which will give me a result set of the substance ID and name (substances.id, substances.name) and the CAS as a HTML string (cas_values which comes from cas.value):
SELECT s.`id`, GROUP_CONCAT(c.`value` ORDER BY c.`id` SEPARATOR '<br>') cas_values, GROUP_CONCAT(s.`name` ORDER BY s.`id`) substance_name FROM substances s LEFT JOIN cas_substances cs ON s.id = cs.substance_id LEFT JOIN cas c ON cs.cas_id = c.id GROUP BY s.id;
Sample output:
id | cas_values | substance_name
----------------------------------------
1 | 133-24<br> | Chemical A
455-213<br>
21-234
-----|----------------|-----------------
2 999-23 | Chemical B
-----|----------------|-----------------
3 | | Chemical C
-----|----------------|-----------------
As you can see the cas_values column contains the HTML string (which may also be an empty string as in the case of "Chemical C"). I want to write the data in the cas_values column into substances.cas_html. However I can't piece together how to do this because other posts I'm reading get the data for the UPDATE in one column - I have other columns returned by my SELECT query.
Essentially the problem is that in my "sample output" table above I have 3 columns being returned. Other SO posts seem to have just 1 column being returned which is the actual values that are used in the UPDATE query (in this case on the substances table).
Is this possible?
I am using MySQL 5.5.56-MariaDB
These are the structures of the tables, if this helps:
mysql> DESCRIBE substances;
+-------------+-----------------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+-------------+-----------------------+------+-----+---------+----------------+
| id | mediumint(8) unsigned | NO | PRI | NULL | auto_increment |
| app_id | varchar(8) | NO | UNI | NULL | |
| name | varchar(1500) | NO | | NULL | |
| date | date | NO | | NULL | |
| cas_html | text | YES | | NULL | |
+-------------+-----------------------+------+-----+---------+----------------+
4 rows in set (0.01 sec)
mysql> DESCRIBE cas;
+-------+-----------------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+-------+-----------------------+------+-----+---------+----------------+
| id | mediumint(8) unsigned | NO | PRI | NULL | auto_increment |
| value | varchar(13) | NO | UNI | NULL | |
+-------+-----------------------+------+-----+---------+----------------+
2 rows in set (0.01 sec)
mysql> DESCRIBE cas_substances;
+--------------+-----------------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+--------------+-----------------------+------+-----+---------+----------------+
| id | int(10) unsigned | NO | PRI | NULL | auto_increment |
| cas_id | mediumint(8) unsigned | NO | MUL | NULL | |
| substance_id | mediumint(8) unsigned | NO | MUL | NULL | |
+--------------+-----------------------+------+-----+---------+----------------+
3 rows in set (0.02 sec)
Try something like this :
UPDATE substances AS s,
(
SELECT s.`id`,
GROUP_CONCAT(c.`value` ORDER BY c.`id` SEPARATOR '<br>') cas_values,
GROUP_CONCAT(s.`name` ORDER BY s.`id`) substance_name
FROM substances s
LEFT JOIN cas_substances cs ON s.id = cs.substance_id
LEFT JOIN cas c ON cs.cas_id = c.id
GROUP BY s.id
) AS t
SET s.cas_html=t.cas_values
WHERE s.id = t.id
If you don't want to modify all the value, the best way to limit the update to test it, is to add a condition in the where, something like that :
...
WHERE s.id = t.id AND s.id = 1
i have two table a,b and both tables structure is same as below
+-----------+--------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+-----------+--------------+------+-----+---------+----------------+
| srno | int(11) | NO | PRI | NULL | auto_increment |
| domain | varchar(50) | NO | UNI | NULL | |
| timestamp | timestamp | YES | | NULL | |
| source | varchar(100) | YES | | NULL | |
+-----------+--------------+------+-----+---------+----------------+
i want domain count from both table on particular date
so plz help
I think the tricky part of the question is that you need union all to bring the tables together. The rest of the question is unclear. If I interpret it as getting all domains with their counts on one particular day:
select domain, count(*)
from ((select a.* from a) union all
(select b.* from b)
) ab
where timestamp >= $YOURDATE and
timestamp < date_add($YOURDATE, interval 1 day)
group by domain;
Note: Having two tables with exactly the same structure is usually a sign of poor database design. A single entity is usually placed in a single table. More typically, there would be one table with a column specifying "a" or "b".
I want to create a student table with column 'student_birthday' and its format should be dd-mm-yy.
create table `student`.`studentinfo`(
`student_id` int(10) not null auto_increment,
`student_name` varchar(45) not null,
`student_surname` varchar(45) not null,
`student_birthday` date(???),
(some lines of code)
primary key(student_id));
what should be inputted in the (???) to get the right format above?
Just use "DATE" without the brackets. The brackets are only needed for certain column types where you want to specify the maximum number of bytes/characters that can be stored.
For MySQL, it's documented at https://dev.mysql.com/doc/refman/5.7/en/date-and-time-types.html
The following example will explain your problem. I am using MySQL 5.7.18.
Firstly I have described the structure of users table as I am going to create posts table with FOREIGN KEY.
Later I created posts table and it has a DATE field named created with many other columns.
Finally I inserted 1 row in the newly created table.
mysql> desc users;
+-------------+-------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------------+-------------+------+-----+---------+-------+
| id | bigint(20) | NO | PRI | NULL | |
| fname | varchar(50) | NO | | NULL | |
| lname | varchar(50) | NO | | NULL | |
| uname | varchar(20) | NO | | NULL | |
| email | text | NO | | NULL | |
| contact | bigint(12) | NO | | NULL | |
| profile_pic | text | NO | | NULL | |
+-------------+-------------+------+-----+---------+-------+
7 rows in set (0.00 sec)
mysql> CREATE TABLE posts(id BIGINT NOT NULL AUTO_INCREMENT PRIMARY KEY, title text NOT NULL, description text NOT NULL, posted_by bigint, FOREIGN KEY(posted_by) REFERENCES users(id) ON DELETE CASCADE ON UPDATE RESTRICT , created DATE);
Query OK, 0 rows affected (0.01 sec)
mysql> desc posts;
+-------------+------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+-------------+------------+------+-----+---------+----------------+
| id | bigint(20) | NO | PRI | NULL | auto_increment |
| title | text | NO | | NULL | |
| description | text | NO | | NULL | |
| posted_by | bigint(20) | YES | MUL | NULL | |
| created | date | YES | | NULL | |
+-------------+------------+------+-----+---------+----------------+
5 rows in set (0.00 sec)
mysql> INSERT INTO posts(title, description, posted_by, created) values("Getting started with MySQL", "Excellent Database system", 1, "2017-05-26");
Query OK, 1 row affected (0.00 sec)
mysql> select * from posts;
+----+----------------------------+---------------------------+-----------+------------+
| id | title | description | posted_by | created |
+----+----------------------------+---------------------------+-----------+------------+
| 1 | Getting started with MySQL | Excellent Database system | 1 | 2017-05-26 |
+----+----------------------------+---------------------------+-----------+------------+
1 row in set (0.00 sec)
mysql>
The datatype date on its own is enough to represent a date value. The format will matter when you are displaying the data, for which you can use the FORMAT function on your date column.
I should add that there is a certain amount of flexibility as to the format when inserting date time literals as documented here.
Let's assume I have the below table
mysql> desc countrylist;
+---------+-------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+---------+-------------+------+-----+---------+-------+
| country | varchar(32) | YES | | NULL | |
+---------+-------------+------+-----+---------+-------+
1 row in set (0.02 sec)
While querying the table, I always want 'USA' in the result whether or not the value is there in the table, in addition to other countries in the table. How do I handle that?
TIA.
James.
You can use UNION:
SELECT country FROM countrylist
UNION
SELECT 'USA'
I have a table:
+----------------+--------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+----------------+--------------+------+-----+---------+----------------+
| fooID | int(11) | NO | PRI | NULL | auto_increment |
| fooDetails | varchar(200) | YES | | NULL | |
| fooListingID | int(10) | YES | | NULL | |
| fooStatus | tinyint(4) | YES | | 0 | |
+----------------+--------------+------+-----+---------+----------------+
I would like to merge data from a similar table with this table but I would like the data to be alternating so that existing data in this table will all be odd "fooID" and the new inserts will all be the even "fooID".
Ideas?
I've interpreted your problem as you make to make all the existing fooIDs odd, and then merge into that table some new, even fooIDs.
You can accomplish this fairly easily:
#first make all the existing ids odd
UPDATE oldtable SET fooID=fooID*2-1;
#now insert rows from the other table, making sure the ids are even
INSERT INTO oldtable (fooID,fooDetails,fooListingID,fooStatus)
SELECT fooID*2,fooDetails,fooListingID,fooStatus FROM newtable;
You can insert the result of a select statement. Use modulo for alternating ids:
INSERT INTO NewTable
SELECT column1, column2
FROM OldTable
WHERE NOT id % 2