I am trying to run an MySQL query to copy over data from an old table (ps__product_review/rate) to a new table (ps_product_comment/grade) based on review ID (id_product_comment). But I am a bit lost on the SQL query, this is what I have but keep getting errors.
INSERT INTO ps_product_comment [(grade)]
SELECT rate
FROM ps__product_review
[WHERE ps__product_review.id_product_comment=ps_product_comment.id_product_comment];
Can anyone help write the correct query?
Edit:Essentially I am trying to populate the Grade column in the new table below.
Old table (ps__product_review)
+--------------------+----------+-----+
| id_product_comment | Comment | Rate|
+--------------------+----------+-----+
| 1 | Good | 2 |
| 2 | Great | 5 |
| 3 | OK | 3 |
| 4 | Brill | 4 |
| 5 | OK | 3 |
| 6 | Average | 2 |
| 7 | Bad | 1 |
+--------------------+----------+-----+
New Table (ps_product_comment)
+--------------------+----------+-------+
| id_product_comment | Comment | Grade |
+--------------------+----------+-------+
| 1 | Good | |
| 2 | Great | |
| 3 | OK | |
| 4 | Brill | |
| 5 | OK | |
| 6 | Average | |
| 7 | Bad | |
+--------------------+----------+-------+
If you want to update table with data from another table, use UPDATE with JOIN
UPDATE ps_product_comment
JOIN ps__product_review
ON ps__product_review.id_product_comment = ps_product_comment.id_product_comment
SET ps_product_comment.grade = ps__product_review.rate;
Remove the square brackets and I think you are missing the JOIN(since you are using that in your where clause):
INSERT INTO ps_product_comment (grade)
SELECT rate
FROM ps__product_review inner join ps_product_comment on
ps__product_review.id_product_comment=ps_product_comment.id_product_comment;
Related
I'm trying to break up a SQL table that needs to take a users name and find the unique user ID's from up to 4 systems.
The data is currently like this:
| Name | User_ID |
-----------------
| A | 10 |
| A | 110 |
| A | 1500 |
| A | 4 |
| B | 20 |
| B | 100 |
| B | 2 |
| C | 10 |
I need to pivot it around the user's name to look like this (the id's don't need to be in numerical order as the SYS#_ID for each doesn't matter):
| Name | SYS1_ID | SYS2_ID | SYS3_ID | SYS4_ID |
------------------------------------------------
| A | 4 | 10 | 110 | 1500 |
| B | 2 | 20 | 100 | NULL |
| C | 10 | NULL | NULL | NULL |
This is the code I have tried on MySQL:
PIVOT(
COUNT(User_ID)
FOR Name
IN (SYS1_ID, SYS2_ID, SYS3_ID, SYS4_ID)
)
AS PivotedUsers
ORDER BY PivotedUsers.User_Name;
I'm unsure if PIVOT works on MySQL as I keep getting an error "PIVOT unknown". Is there a way to find the values that each user has and if they do not appear in the table already add them to the next column with a max of 4 values?
I have the next table setup, two tables related by an intermediate table, like this:
Client
| client_id | ...|field_X |
| 1 | ...|value1 |
| 2 | ...|value2 |
| 3 | ...|value3 |
Project
| project_id | ...|field_X |
| 1 | ...| |
| 2 | ...| |
| 3 | ...| |
| 4 | ...| |
| 5 | ...| |
| 6 | ...| |
| 7 | ...| |
client_project
| client_id | project_id|
| 1 | 2 |
| 1 | 3 |
| 2 | 4 |
| 2 | 5 |
| 3 | 6 |
| 3 | 7 |
The field_x in the table project is new and i have to fill it with the data from table client to get approximately something like this:
Project
| project_id | ...|field_X |
| 1 | ...| |
| 2 | ...|value1 |
| 3 | ...|value1 |
| 4 | ...|value2 |
| 5 | ...|value2 |
| 6 | ...|value3 |
| 7 | ...|value3 |
i dont know hot to deal with the intermediate table. i have tried this code but it doesnt work.
INSERT INTO project
(field_x)
(select field_x
from
client_project
inner join
client
where client_project.client_id = client.client_id
);
I have the idea of what i have to do but i am not able to translate it into a sql command because of the intermeditate table.Could someone explain how to deal with it?
Thanks in advance.
I assume you already have all entries in the project table but they're missing the Field_X property? So what you need is an update, not an insert
UPDATE project p, client c, project_client pc SET p.Field_X=c.Field_X WHERE p.ID=pc.ProjectID AND c.ID=pc.ClientID
However, be advised that having the same data in two places is not a good practise; if possible always put one fact in only one place.
I am trying to get average of latency for each items that holds into two separate mysql table. Let me more clarify that I have two mysql tables as below,
table: monitor_servers
+-----------+-----------------+
| server_id | label |
+-----------+-----------------+
| 1 | a.com |
| 2 | b.com |
+-----------+-----------------+
table: monitor_servers_uptime
+-------------------+-----------+-----------+
| servers_uptime_id | server_id | latency |
+-------------------+-----------+-----------+
| 1 | 1 | 0.4132809 |
| 3 | 1 | 0.4157769 |
| 6 | 1 | 0.4194210 |
| 9 | 1 | 0.4140880 |
| 12 | 2 | 0.4779439 |
| 15 | 2 | 0.4751789 |
| 18 | 2 | 0.4762829 |
| 22 | 2 | 0.4706681 |
+-------------------+-----------+-----------+
Basically, each domains associated with the same id_number in both tables. While I am running the query below, getting average of each items.
select monitor_servers.label, avg(monitor_servers_uptime.latency)
from monitor_servers,monitor_servers_uptime
where monitor_servers.server_id = monitor_servers_uptime.server_id
group by monitor_servers.server_id;
The query ended up,
+---------------------+-------------------------------------+
| label | avg(monitor_servers_uptime.latency) |
+---------------------+-------------------------------------+
| a.com | 0.41393792995 |
| b.com | 0.47551423171 |
+---------------------+-------------------------------------+
My questions are doing am i in wright way while getting average of the each items and how can i insert new average result of each items into a new column on table monitor_servers ? And also what happens if some of latency rows are NULL ?
**Edit : What i am trying to achieve in one query result is **
+-----------+----------+------------------+
| server_id | label | avg. |
+-----------+----------+------------------+
| 1 | a.com | 0.41393792995 |
| 2 | b.com | 0.47551423171 |
+-----------+-----------------------------+
Thanks in advance,
Your calculation seems to be correct.
You could add another column to the monitor_servers using sql:
ALTER TABLE monitor_servers ADD avg_latency DEFAULT 0.0 NOT NULL
For doing the AVG calculation check this answer.
I've the following table:
| id | Name | Date of Birth | Date of Death | Result |
| 1 | John | 3546565 | 3548987 | |
| 2 | Mary | 5233654 | 5265458 | |
| 3 | Lewis| 6546876 | 6548752 | |
| 4 | Mark | 6546546 | 6767767 | |
| 5 | Steve| 6546877 | 6548798 | |
And I need to do this for the whole table:
Result = 1, if( current_row(Date of Birth) - row_above_current_row(Date of Death))>X else 0
To make things easier, I guess, I created the same table above but with 2 extra id fields: id_minus_one and id_plus_one
Like this:
| id | id_minus_one | id_plus_one |Name | Date_of_Birth | Date_of_Death | Result |
| 1 | 0 | 2 |John | 3546565 | 3548987 | |
| 2 | 1 | 3 |Mary | 5233654 | 5265458 | |
| 3 | 2 | 4 |Lewis| 6546876 | 6548752 | |
| 4 | 3 | 5 |Mark | 6546546 | 6767767 | |
| 5 | 4 | 6 |Steve| 6546877 | 6548798 | |
So my approach would be something like (in pseudo code):
for id=1, ignore result. (Because there is no row above)
for id=2, Result = 1 if( (Where id=2).Date_of_Birth - (where id_minus_one=id-1).Date_of_Death )>X else 0
for id=3, Result = 1 if( (Where id=3).Date_of_Birth - (where id_minus_one=id-1).Date_of_Death)>X else 0
and so on for the whole table...
Just ignore id_plus_one if there is no need for it, I'll use it later for the same thing. So, if I manage to do this for id_minus_one I'll manage for id_plus_one as they are the same algorithm.
My question is how to pass that pseudo code into SQL code, I can't find a way to relate both ids in just one select.
Thank you!
As you describe this, it is just a self join with some logic on the select:
select t.*,
((t.date_of_birth - tprev.date_of_death) > x) as flag
from t left outer join
t tprev
on t.id_minus_one = tprev.id
I'm relatively new to MySQL and have come across a problem to which I cannot seem to find a solution. I have searched but could not find an answer. I'm open to the possibility that I'm not asking the question correctly. Here goes:
I'm trying to use the name of a given column and the values within that column from one table to pull values from another table. The first table contains 3 columns with the response codified. The second table contains the definitions for each code for each item. The same number code is associated with different meanings depending on the item. For example:
table1 (this table cannot change):
--------------------------------------------------------------
|result_id | f_initial | l_name | item_A | item_B | item_C |
--------------------------------------------------------------
| 1 | j | doe | 1 | 3 | 2 |
| 2 | k | smith | 3 | 1 | 2 |
| 3 | l | williams | 2 | 2 | 1 |
--------------------------------------------------------------
table2 (this table can be modified, split, or whatever needs to be done):
-------------------------------------------
|item_id | item_name | score | definition |
-------------------------------------------
| 1 | item_A | 1 | agree |
| 2 | item_A | 2 | neutral |
| 3 | item_A | 3 | disagree |
| 4 | item_B | 1 | likely |
| 5 | item_B | 2 | not likely |
| 6 | item_B | 3 | no reply |
| 7 | item_C | 1 | yes |
| 8 | item_C | 2 | no |
-------------------------------------------
My goal is for the query to output the following:
--------------------------------------------------------------------
|result_id | f_initial | l_name | item_A | item_B | item_C |
--------------------------------------------------------------------
| 1 | j | doe | agree | no reply | no |
| 2 | k | smith | disagree | likely | no |
| 3 | l | williams | neutral | not likely | yes |
--------------------------------------------------------------------
Any assistance or guidance is greatly appreciated. Thank you in advance.
You must join the two tables on the item_A/B/C and score columns
select t1.result_id, t1.f_initial, t1.l_name,
t2a.definition as item_a,
t2b.definition as item_b,
t2c.definition as item_c
from table1 t1
join table2 t2a on t2a.score = t1.item_a
join table2 t2b on t2b.score = t1.item_b
join table2 t2c on t2c.score = t1.item_c
where t2a.item_name = 'item_A'
and t2b.item_name = 'item_B'
and t2c.item_name = 'item_C'