I'm trying to insert into a table with the following syntax:
INSERT INTO table1(
col1, col2, col3)
SELECT distinct
col1, col2, getDate()
FROM table2 WHERE NOT EXISTS(
SELECT 1 FROM table1, table2
WHERE ((table1.col1 = table2.col1) or (table1.col1 is null and table2.col1 is null))
AND ((table1.col2 = table2.col2) or (table1.col2 is null and table2.col2 is null)))
But when I run the query, it shows (0 row(s) affected).
The SELECT statement within the NOT EXISTS statement returns the correct number of rows that I don't want inserted. If I try to insert into the table without the WHERE NOT EXISTS statement, it inserts everything. I only want to insert rows that are not already in table1.
Try this:
INSERT INTO table1(col1, col2, col3)
SELECT distinct col1, col2, getDate()
FROM table2 WHERE NOT EXISTS(
SELECT 1 FROM table1
WHERE ((table1.col1 = table2.col1) or (table1.col1 is null and table2.col1 is null))
AND ((table1.col2 = table2.col2) or (table1.col2 is null and table2.col2 is null)))
You can optimize this query quite a bit, but as a quick fix you could change:
SELECT 1 FROM table1, table2
to:
SELECT 1 FROM table1
This will tie the outer table2 into your subquery.
Related
In my MySql database, I want to create select query which should give output like this:
in my select query i want a column output as 1, if the column value present in a list returned by a select query else 0 .
Select col1,col2,
,IF col3 IN
((select col from tabl2 ),1,0)AS col5
from tbl1.
Thanks in Advance
SELECT col1, col2,
IF col3 IN ((select col from tabl2 ),1,0) AS col5
FROM tbl1
Using IF and subquery in MySQL
SELECT table1.column1, table1.column2,
(
SELECT IF (
(SELECT column3 FROM table1 WHERE column3 IN (SELECT column FROM table2)), 1, 0
)
) AS column_output
FROM table1
In general:
SELECT col1,
col2,
CASE WHEN col3 IN (select col from tabl2)
THEN 1
ELSE 0
END AS col5
FROM tbl1
Specific for MySQL:
SELECT col1,
col2,
col3 IN (select col from tabl2) AS col5
FROM tbl1
I am trying to insert a text with a value from another table, can it be done in one query?
if I remove ('value from table2 : ' +) from the query, the value selected is inserted properly, but when I add it, the value inserted is 0.
INSERT INTO table1 ( col1, col2, col3, col4)
VALUES ( 896, 'azer', 'value from table2 : ' + (SELECT table2.col2 FROM table2 WHERE table2.col1 = 5 ), 675)
the inserted value in col3 should like this: "value from table2 : zsqd"
You need to use CONCAT function for concatenation.
INSERT INTO table1 ( col1, col2, col3, col4)
VALUES ( 896, 'azer', (SELECT CONCAT('value from table2 :',table2.col2) FROM table2 WHERE table2.col1 = 5 ), 675)
Very simple
If col3 in table1 is varchar or text then try this
INSERT INTO table1 ( col1, col2, col3, col4)
VALUES ( 896, 'azer', (SELECT CONCAT("value from table2 : ",table2.col2) FROM table2 WHERE table2.col1 = 5 ), 675)
I have a query like this:
INSERT INTO table1(col1,col2,col4)
VALUES (1, (select col1 from table2 where col2 = :param), 1);
The above query works as well. Now I want to use two columns from table2, like this:
INSERT INTO table1(col1,col2,col3,col4)
VALUES (1, (select col1,col2 from table2 where col2 = :param), 1);
But second query doesn't work, How can I fix it?
INSERT INTO table1(col1, col2, col3, col4)
select 1, col1, col2, 1
from table2
where col2 = :param;
i want to to select distinct values from multiple columns of same table with their count
example
and the output should be like this
Since the OP says in his comment that he uses MYSQL this should work
SELECT data,COUNT(data)
FROM
(
SELECT COL1 data
FROM tableso
UNION ALL
SELECT COL2
FROM tableso
UNION ALL
SELECT COL3
FROM tableso
UNION ALL
SELECT COL4
FROM tableso
UNION ALL
SELECT COL6
FROM tableso
UNION ALL
SELECT COL7
FROM tableso
) finaltable group by data;
SQL FIDDLE: http://sqlfiddle.com/#!2/1f8cf/10
I dont think the accepted answer works on MYSQL
UPDATE:
The op has changed his mind about the database(to MSSQL) and the accepted answer has both db versions
Since you are using Sql Server too, will suggest you this way
Use Table valued constructor to convert the columns to rows then count the name
This will avoid multiple table scan's.
SELECT name,
[count]=Count(1)
FROM yourtable
CROSS apply (VALUES (col1),(COL2),(col3),(col4),(COL6),(col7)) cs (name)
GROUP BY name
Note : This will not work in Mysql
SQLFIDDLE DEMO
Get all column values to one row and find the count
SQL SERVER
;WITH CTE AS
(
SELECT COL1 Name
FROM YOURTABLE
UNION ALL
SELECT COL2
FROM YOURTABLE
UNION ALL
SELECT COL3
FROM YOURTABLE
UNION ALL
SELECT COL4
FROM YOURTABLE
UNION ALL
SELECT COL6
FROM YOURTABLE
UNION ALL
SELECT COL7
FROM YOURTABLE
)
SELECT DISTINCT Name,COUNT(Name) OVER(PARTITION BY Name) [COUNT]
FROM CTE
MYSQL
SELECT Name,COUNT(*) [COUNT]
(
SELECT COL1 Name
FROM #TEMP
UNION ALL
SELECT COL2
FROM #TEMP
UNION ALL
SELECT COL3
FROM #TEMP
UNION ALL
SELECT COL4
FROM #TEMP
UNION ALL
SELECT COL6
FROM #TEMP
UNION ALL
SELECT COL7
FROM #TEMP
)TAB
GROUP BY Name
I have a table in MySQL:
Col1 | Col2
a A
a B
c C
a B
i want to create a table like this:
col1 | col2 | freq
a A 0.33
a B 0.67
col1 is a specified item in Col1. col2 is distinct item that has occured with the specified item(i.e. a). freq column is the frequency of appearence of item in col2.
Can someone give me a hint of how to create such a query? Thanks a lot.
try this:
Select A.Col1, A.Col2, A.Count1 * 1.0 / B.Count2 As Freq
From (
Select Col1, Col2, Count(*) As Count1
From YourTableName
Group By Col1, Col2
) As A
Inner Join (
Select Col1, Count(*) As Count2
From YourTableName
Group By Col1
) As B
On A.Col1 = B.Col1
You can also use this which is coded in SQL server
DECLARE #Count INT;
SELECT #Count = COUNT(1) FROM YourTableName WHERE Col1 = 'a'
SELECT Col1, Col2, CAST(COUNT(1)* 1.00 /#Count AS DECIMAL(4,2) ) AS Frequency
FROM YourTableName
WHERE Col1 = 'a'
GROUP BY Col1, Col2
this way you have a better performance
With window functions
SELECT Col1, Col2, Count1*1.0 / Count2 AS freq
FROM (
SELECT
Col1,
Col2,
COUNT() OVER(PARTITION BY Col1, Col2) AS Count1,
COUNT() OVER(PARTITION BY Col1) AS Count2
FROM YourTableName
)
GROUP BY Col1, Col2