Two questions:
1)
There are several tables that are used as an archive for other tables.
To do so, there is a
INSERT INTO data_archive_table (SELECT * FROM data_table)
The problem is that the data_table.id should be kept as data_archive_table.old_id.
Is there a way to write a query that will look like: SELECT *, id AS old_id FROM data_table, while the results columns will have ONLY the old_data column, and NOT the original id column?
Using all column names is the only option I see, but I prefer to avoid it.
2)
I want to add a virtual column named deleted_time to the insertion query, that will hold the current time.
Can it be done? if so - how ?(tutorials will be great)
Try this:
1.) You can use something like this query:
INSERT INTO data_archive_table
SELECT id AS old_id -- be sure that data_archive_table has column oldID
,... -- You need to specify the names of the columns
FROM data_table
WHERE id = 'IDHERE' -- If you want to have condition.
2.) For this, you can add the value directly in you select statement
INSERT INTO `tableName`
SELECT colA,
colB,
, ...
, NOW() as deleted_time -- NOW() is a function in MySQL
FROM `sourceTable`
WHERE colA = 'IDHERE' -- If you want to have condition.
NOW() in MySQL
Related
Below is the table i am trying to write a query for to add new rows for every user.
My question is how do i add a new row for every user? Which means for userId 2 I add AccId 4 and similarly for 7 and 8. Since there is no concept of for loop in sql, do i make use of while? If so, how to loop through the userIds since the IDs are not in equal increments?
something like this maybe:
Insert Into mytable (UserID, AccID)
Select UserID, max(accId)+1
From MyTable
Group By UserID
You can re-run it every time, you will create the next value.
Untested on a MySql server:
INSERT INTO MyTable ( ID, AccId )
SELECT MyValues.ID, MyValues.Espr1
FROM (SELECT MyTable.ID, Max([AccId]+1) AS Espr1
FROM MyTable
GROUP BY MyTable.ID) AS MyValues;
Basically we prefetch Id a AccId grouping the values of Id and grabbing the Max of AccId.
Then we add these rows to the main table. Repeating the query we will add the value 5 (AccId) and so on, always adding 1
I have 2 tables
test_table:
id data_text
1 *some text*
undo_test_table:
id data_text modification_date
.
CREATE TRIGGER undo_trigger BEFORE UPDATE
ON test_table
FOR EACH ROW
INSERT INTO undo_test_table SELECT *,NOW() AS modification_date
FROM test_table
WHERE id = NEW.id
What I try with that, is if one column on first table is modified then the trigger (undo_trigger) is fired and copy entire row to another table (undo_test_table )
But in the second table (undo_test_table ) I have one more column (modification_date)
The problem:
The above example working good but I don't know how to make that working if I change the (modification_date) column at first place instead as last place in (undo_test_table)
like this:
undo_test_table:
modification_date id data_text
I have tried :
SELECT NOW() AS modification_date,* FROM test_table ...
instead
SELECT *,NOW() AS modification_date FROM test_table ...
But got sintax error.
I think i need some like an UNION but I don't know how I can use NOW() AS modification_date in one UNION
You need to qualify the * with the table's name:
SELECT NOW() AS modification_date, t.*
-- Here ---------------------------^
FROM test_table
-- etc...
I have two tables ,location and locationdata. I want to query data from both the tables using join and to store the result in a new table(locationCreatedNew) which is not already present in the MySQL.Can I do this in MySQL?
SELECT location.id,locationdata.name INTO locationCreatedNew FROM
location RIGHT JOIN locationdata ON
location.id=locationdata.location_location_id;
Your sample code in OP is syntax in SQL Server, the counter part of that in MySQL is something like:
CREATE TABLE locationCreatedNew
SELECT * FROM location RIGHT JOIN locationdata
ON location.id=locationdata.location_location_id;
Referance: CREATE TABLE ... SELECT
For CREATE TABLE ... SELECT, the destination table does not preserve information about whether columns in the selected-from table are generated columns. The SELECT part of the statement cannot assign values to generated columns in the destination table.
Some conversion of data types might occur. For example, the AUTO_INCREMENT attribute is not preserved, and VARCHAR columns can become CHAR columns. Retrained attributes are NULL (or NOT NULL) and, for those columns that have them, CHARACTER SET, COLLATION, COMMENT, and the DEFAULT clause.
When creating a table with CREATE TABLE ... SELECT, make sure to alias any function calls or expressions in the query. If you do not, the CREATE statement might fail or result in undesirable column names.
CREATE TABLE newTbl
SELECT tbl1.clm, COUNT(tbl2.tbl1_id) AS number_of_recs_tbl2
FROM tbl1 LEFT JOIN tbl2 ON tbl1.id = tbl2.tbl1_id
GROUP BY tbl1.id;
NOTE: newTbl is the name of the new table you want to create. You can use SELECT * FROM othertable which is the query that returns the data the table should be created from.
You can also explicitly specify the data type for a column in the created table:
CREATE TABLE foo (a TINYINT NOT NULL) SELECT b+1 AS a FROM bar;
For CREATE TABLE ... SELECT, if IF NOT EXISTS is given and the target table exists, nothing is inserted into the destination table, and the statement is not logged.
To ensure that the binary log can be used to re-create the original tables, MySQL does not permit concurrent inserts during CREATE TABLE ... SELECT.
You cannot use FOR UPDATE as part of the SELECT in a statement such as CREATE TABLE new_table SELECT ... FROM old_table .... If you attempt to do so, the statement fails.
Please check it for more. Hope this help you.
Use Query like below.
create table new_tbl as
select col1, col2, col3 from old_tbl t1, old_tbl t2
where condition;
I have a table that contains some duplicate redords. I want to make records unique. I created a new table (say, destination) and I specified a unique column in it. How can copy records from table1 (source) such that, if the record inserted in the destination table, it does not insert it again.
You can use the "select into" construct and select insert only distinct rows, like this:
insert into table_without_dupes (column0, column1) select distinct column0, column1 from table_with_dupes
If you have autoincrement or other columns that makes the rows distinct, you can just leave them out of the insert and select parts of the statement.
Edit:
If you want to detect duplicates by a single column, you can use group by:
insert into table_without_dupes (column0, column1) select column0, column1 from table_with_dupes group by column0
MySQL will allow you to refer non-aggregated columns in select, but remember that the documentation says "The server is free to choose any value from each group", if you want to select one specific row of the groups, you might find this example useful.
Generic approach
insert into destination(col1,col2)
select DISTINCT col1,col2 from source as s where not exists
(select * from destination as d where d.col1=s.col1)
Edited
insert into destination(col1,col2)
SELECT distinct col1,col2 from source
Edited (Assuming col3 is duplicated and you want only one copy of it.)
insert into destination(col1,col2,col3,....,colN)
SELECT col1,col2,col3,...,colN from source as s1 inner join
(
select col1,col2,max(col3) as col3
from source
group by col1,col2
) as s2 on t1.col1=t2.col1 and t1.col2=t2.col2 and t1.col3=t2.col3
insert into <dest_table_name>
select distinct * from <source_table_name>;
I have this Statement:
INSERT INTO qa_costpriceslog (item_code, invoice_code, item_costprice)
VALUES (1, 2, (SELECT item_costprice FROM qa_items WHERE item_code = 1));
I'm trying to insert a value copy the same data of item_costprice, but show me the error:
Error Code: 1136. Column count doesn't match value count at row 1
How i can solve this?
Use numeric literals with aliases inside a SELECT statement. No () are necessary around the SELECT component.
INSERT INTO qa_costpriceslog (item_code, invoice_code, item_costprice)
SELECT
/* Literal number values with column aliases */
1 AS item_code,
2 AS invoice_code,
item_costprice
FROM qa_items
WHERE item_code = 1;
Note that in context of an INSERT INTO...SELECT, the aliases are not actually necessary and you can just SELECT 1, 2, item_costprice, but in a normal SELECT you'll need the aliases to access the columns returned.
You can just simply e.g.
INSERT INTO modulesToSections (fk_moduleId, fk_sectionId, `order`) VALUES
((SELECT id FROM modules WHERE title="Top bar"),0,-100);
I was disappointed at the "all or nothing" answers. I needed (again) to INSERT some data and SELECT an id from an existing table.
INSERT INTO table1 (id_table2, name) VALUES ((SELECT id FROM table2 LIMIT 1), 'Example');
The sub-select on an INSERT query should use parenthesis in addition to the comma as deliminators.
For those having trouble with using a SELECT within an INSERT I recommend testing your SELECT independently first and ensuring that the correct number of columns match for both queries.
Your insert statement contains too many columns on the left-hand side or not enough columns on the right hand side. The part before the VALUES has 7 columns listed, but the second part after VALUES only has 3 columns returned: 1, 2, then the sub-query only returns 1 column.
EDIT: Well, it did before someone modified the query....
As a sidenote to the good answer of Michael Berkowski:
You can also dynamically add fields (or have them prepared if you're working with php skripts) like so:
INSERT INTO table_a(col1, col2, col3)
SELECT
col1,
col2,
CURRENT_TIMESTAMP()
FROM table_B
WHERE b.col1 = a.col1;
If you need to transfer without adding new data, you can use NULL as a placeholder.
If you have multiple string values you want to add, you can put them into a temporary table and then cross join it with the value you want.
-- Create temp table
CREATE TEMPORARY TABLE NewStrings (
NewString VARCHAR(50)
);
-- Populate temp table
INSERT INTO NewStrings (NewString) VALUES ('Hello'), ('World'), ('Hi');
-- Insert desired rows into permanent table
INSERT INTO PermanentTable (OtherID, NewString)
WITH OtherSelect AS (
SELECT OtherID AS OtherID FROM OtherTable WHERE OtherName = 'Other Name'
)
SELECT os.OtherID, ns.NewString
FROM OtherSelect os, NewStrings ns;
This way, you only have to define the strings in one place, and you only have to do the query in one place. If you used subqueries like I initially did and like Elendurwen and John suggest, you have to type the subquery into every row. But using temporary tables and a CTE in this way, you can write the query only once.