I have two tables with identical schema. Let's name them TestTable and TestTableTemp. I need to copy just two columns from TestTableTemp to TestTable without disrupting other data. The rows in TestTable are a subset of those in TestTableTemp. Let's say the columns that I need to copy are named Column1 and Column2 and that they have identical primary keys reference by column primaryKey.
In mysql I believe this could be done as such or something similar:
UPDATE TestTable, TestTableTemp
SET TestTable.Column1 = TestTableTemp.Column1, TestTable.Column2 = TestTableTemp.Column2
WHERE TestTable.primaryKey = TestTableTemp.primaryKey
Sqlite does not allow for multiple tables to be defined on the update statement as can been seen in their reference data here: http://www.sqlite.org/lang_update.html
The best I could come up with is such:
UPDATE TestTable SET
Column1 = (select TestTableTemp.Column1 from TestTableTemp, TestTable where TestTable.primaryKey = TestTableTemp.primaryKey),
Column2 = (select TestTableTemp.Column2 from TestTableTemp, TestTable where TestTable.primaryKey = TestTableTemp.primaryKey)
WHERE EXISTS(select * from TestTableTemp where TestTable.primaryKey = TestTableTemp.primaryKey"
This gives me a syntax error near "." I am guessing this is because I cannot reference TestTable in the scalar expressions.
Can anyone point me in the right direction? Any help is much appreciated.
EDIT:
I cleaned up the second query a bit. It seems to just set the Column1 and Column2 to the first row from that column from TestTableTemp.
Your original query for comparison:
UPDATE TestTable, TestTableTemp
SET TestTable.Column1 = TestTableTemp.Column1
, TestTable.Column2 = TestTableTemp.Column2
WHERE TestTable.primaryKey = TestTableTemp.primaryKey
Here is the working query (I just slightly changed your version):
http://sqlfiddle.com/#!5/f3a19/9
UPDATE TestTable
SET
Column1 = ( SELECT TestTableTemp.Column1
FROM TestTableTemp
WHERE TestTableTemp.primaryKey = TestTable.primaryKey )
,Column2 = ( SELECT TestTableTemp.Column2
FROM TestTableTemp
WHERE TestTableTemp.primaryKey = TestTable.primaryKey )
WHERE EXISTS( SELECT NULL
FROM TestTableTemp
WHERE TestTableTemp.primaryKey = TestTable.primaryKey )
;
Related
I need Only one unique result from tableB.Field to tableA.Field
I am using sdo operator sdo_nn, this is the code:
UPDATE table1 t1
SET t1.fieldA = (SELECT T2.fieldB,SDO_NN_DISTANCE(1) distance
FROM table1 T1, table2 T2
WHERE
(sdo_nn(t1.geometry,t2.geometry,'SDO_NUM_RES=1',1)= 'TRUE')
ORDER BY DIST
)
WHERE EXISTS(
SELECT 1
FROM table2 t2
WHERE sdo_nn(t1.geometry, t2.geometry,'SDO_NUM_RES=1',1)='TRUE'
AND(t2.cell_name = 'string1' or t2.cell_name = string2')AND t1.fieldA = NULL
);
In the select sentence of the subquery i get an error because i only use one field(t1.fieldA), but in the sentence i use the operator SDO_NN_DISTANCE(1) and the sql developer count this operator like another field. What is the correct way to write this sentence? I only use sql because i need to insert this code in vba
Thanks!!!
Obviously, you can't (simplified)
set t1.fieldA = (t2.fieldB, distance) --> you want to put two values into a single column
Therefore, get fieldB alone from the subquery which uses analytic function (row_number) to "sort" rows by sdo_nn_distance(1) desc; then get the first row's fieldB value.
Something like this (I hope I set the parenthesis right):
UPDATE table1 t1
SET t1.fieldA =
(SELECT x.fieldB --> only fieldB
FROM (SELECT T2.fieldB, --> from your subquery
SDO_NN_DISTANCE (1) distance,
ROW_NUMBER ()
OVER (ORDER BY sdo_nn_distance (1) DESC) rn
FROM table1 T1, table2 T2
WHERE (sdo_nn (t1.geometry,
t2.geometry,
'SDO_NUM_RES=1',
1) = 'TRUE')) x
WHERE rn = 1) --> where RN = 1
WHERE EXISTS
(SELECT 1
FROM table2 t2
WHERE sdo_nn (t1.geometry,
t2.geometry,
'SDO_NUM_RES=1',
1) = 'TRUE'
AND ( t2.cell_name = 'string1'
OR t2.cell_name = 'string2')
AND t1.fieldA IS NULL);
I'm trying to update my table if any value from table1 = value from table2
Table1 as 1 column with data
Table2 as many columns with data
If table2(data) = table1(data) update
But isn't working
I had one code that was working if i set table2 with 1 column
This one is working but table2 needs to have 1 column only
UPDATE table1
SET column1 = 'correct'
WHERE column2 in (SELECT column1 from table2);
I want to be able to do having more column
maybe something like this:
UPDATE
SET column1 = 'correct'
WHERE column2 in (SELECT * from table2);
The error:
Result: sub-select returns 11 columns - expected 1
How should I do it?
Maybe you can do it with EXISTS:
UPDATE table1
SET column1 = 'correct'
WHERE EXISTS (
SELECT 1 FROM table2
WHERE table1.somecolumn = table2.someothercolumn
);
If you want to check table1.someothercolumn against multiple columns of table2:
UPDATE table1
SET column1 = 'correct'
WHERE EXISTS (
SELECT 1 FROM table2
WHERE table1.somecolumn in (table2.col1, table2.col2, ...)
);
I have two tables, with a same column named user_name, saying table_a, table_b.
I want to, copy from table_b, column_b_1, column_b2, to table_b1, column_a_1, column_a_2, respectively, where the user_name is the same, how to do it in SQL statement?
As long as you have suitable indexes in place this should work alright:
UPDATE table_a
SET
column_a_1 = (SELECT table_b.column_b_1
FROM table_b
WHERE table_b.user_name = table_a.user_name )
, column_a_2 = (SELECT table_b.column_b_2
FROM table_b
WHERE table_b.user_name = table_a.user_name )
WHERE
EXISTS (
SELECT *
FROM table_b
WHERE table_b.user_name = table_a.user_name
)
UPDATE in sqlite3 did not support a FROM clause for a long time, which made this a little more work than in other RDBMS. UPDATE FROM was implemented in SQLite 3.33 however (2020-08-14) as mentioned at: https://stackoverflow.com/a/63079219/895245
If performance is not satisfactory, another option might be to build up new rows for table_a using a select and join with table_a into a temporary table. Then delete the data from table_a and repopulate from the temporary.
Starting from the sqlite version 3.15 the syntax for UPDATE admits a column-name-list
in the SET part so the query can be written as
UPDATE table_a
SET
(column_a_1, column_a_2) = (SELECT table_b.column_b_1, table_b.column_b_2
FROM table_b
WHERE table_b.user_name = table_a.user_name )
which is not only shorter but also faster
the last "WHERE EXISTS" part
WHERE
EXISTS (
SELECT *
FROM table_b
WHERE table_b.user_name = table_a.user_name
)
is actually not necessary
It could be achieved using UPDATE FROM syntax:
UPDATE table_a
SET column_a_1 = table_b.column_b_1
,column_a_2 = table_b.column_b_2
FROM table_b
WHERE table_b.user_name = table_a.user_name;
Alternatively:
UPDATE table_a
SET (column_a_1, column_a_2) = (table_b.column_b_1, table_b.column_b_2)
FROM table_b
WHERE table_b.user_name = table_a.user_name;
UPDATE FROM - SQLite version 3.33.0
The UPDATE-FROM idea is an extension to SQL that allows an UPDATE statement to be driven by other tables in the database. The "target" table is the specific table that is being updated. With UPDATE-FROM you can join the target table against other tables in the database in order to help compute which rows need updating and what the new values should be on those rows
There is an even much better solution to update one table from another table:
;WITH a AS
(
SELECT
song_id,
artist_id
FROM
online_performance
)
UPDATE record_performance
SET
op_song_id=(SELECT song_id FROM a),
op_artist_id=(SELECT artist_id FROM a)
;
Update tbl1
Set field1 = values
field2 = values
Where primary key in tbl1 IN ( select tbl2.primary key in tbl1
From tbl2
Where tbl2.primary key in tbl1 =
values);
The accepted answer was very slow for me, which is in contrast to the following:
CREATE TEMPORARY TABLE t1 AS SELECT c_new AS c1, table_a.c2 AS c2 FROM table_b INNER JOIN table_a ON table_b.c=table_a.c1;
CREATE TEMPORARY TABLE t2 AS SELECT t1.c1 AS c1, c_new AS c2 FROM table_b INNER JOIN t1 ON table_b.c=t1.c2;
I am trying to update one column in table1 from a column in table2. Here
is what i am doing but i am getting an ORA error.
ORA-01427: single-row subquery returns more than one row.
update table1 a
set a.art_num = (
select b.art_num from table2 b
where a.comp_id = b.comp_id );
Thanks so much in advance!
This happens because your subquery returns more than one result.
You should check this one:
select b.art_num
from table2 b
where a.comp_id = b.comp_id
You could try to select DISTINCT (search for distinct in the link for documentation) on the subquery:
update table1 a
set a.art_num = (
select distinct(b.art_num)
from table2 b
where a.comp_id = b.comp_id );
I want to add data to table STATISTICS using INSERT statements.
I also want to move new counts to old counts and new date to old date as the new data comes in.
This is where it gets lil tricky because I don't know if there is such a thing as INSERT INTO table with SET in Oracle.
INSERT INTO STATISTICS
SET
MODEL = '&MY_MODEL',
NEW_COUNT =
(
SELECT COUNT(*)
FROM TABLE CLIENTS
),
NEW_DATE = SYSDATE,
OLD_COUNT = NEW_COUNT,
OLD_DATE = NEW_DATE,
PRNCT_CHANGE = ((NEW_COUNT) - (OLD_COUNT)) / (NEW_COUNT)*100
);
How do I accomplish this in Oracle?
This should upsert statistics, adding new ones as you go. It presumes a unique key on MODEL; if that's not true, then you'd have to do inserts as Angelina said, getting only the most recent row for a single MODEL entry.
MERGE INTO STATISTICS tgt
using (SELECT '&MY_MODEL' AS MODEL,
(SELECT COUNT(*) FROM CLIENTS) AS NEW_COUNT,
SYSDATE AS DATE_COUNT,
NULL AS OLD_COUNT,
NULL OLD_DATE,
NULL AS PRCNT_CHANGE
FROM DUAL) src
on (TGT.MODEL = SRC.MODEL)
WHEN MATCHED THEN UPDATE
SET TGT.NEW_COUNT = SRC.NEW_COUNT,
TGT.NEW_DATE = SRC.NEW_DATE,
TGT.OLD_COUNT = TGT.NEW_COUNT,
TGT.OLD_DATE = TGT.NEW_DATE,
TGT.PRCNT_CHG = 100 * (SRC.NEW_COUNT - TGT.NEW_COUNT) / (SRC.NEW_COUNT)
-- NEEDS DIV0/NULL CHECKING
WHEN NOT MATCHED THEN INSERT
(MODEL, NEW_COUNT, NEWDATE, OLD_COUNT, OLD_DATE, PRCNT_CHANGE)
VALUES
(src.MODEL, src.NEW_COUNT, src.NEWDATE, src.OLD_COUNT, src.OLD_DATE, src.PRCNT_CHANGE);
INSERT INTO STATISTICS(MODEL,NEW_COUNT,NEW_DATE,OLD_COUNT,OLD_DATE,PRNCT_CHANGE)
SELECT MODEL,
( SELECT COUNT(*)
FROM TABLE(USERS)
),
SYSDATE,
NEW_COUNT,
NEW_DATE,
(((NEW_COUNT) - (OLD_COUNT)) / (NEW_COUNT)*100)
FROM SEMANTIC.COUNT_STATISTICS
WHERE MODEL = '&MY_MODEL'
AND trunc(NEW_DATE) = trunc(NEW_DATE -1)
;