MySQL Insert from another table with 2 option WHERE statement - mysql

I have done my research but can not figure out how to do this. It is super simple to insert from another table but I want to include WHERE statements.
I want to insert value of a single column, column_Q from table A into table B's column_Q WHERE table A's column_W = '100' and column_Q does not already exist in table B.
I tried:
INSERT INTO B (column_Q) select DISTINCT(column_Q)
from A WHERE column_W = 100 AND b.column_Q<>a.column_Q;
Where am I doing wrong?
PS. Both tables already contain values. No field is Null.


INSERT
INTO b (q)
SELECT DISTINCT q
FROM a
WHERE a.w = 100
AND a.q NOT IN
(
SELECT q
FROM b
)
If your b.q has a UNIQUE constraint defined on it, then just use:
INSERT
IGNORE
INTO b (q)
SELECT q
FROM a
WHERE w = 100


You cannot refer to the left side of the "assignment", because there is no current row from B to compare to (that would be the one you are inserting) You need to check if a similar row is already present in B, like in:
INSERT INTO B (column_Q)
SELECT DISTINCT(A.column_Q)
FROM A
WHERE A.column_W = 100
AND NOT EXISTS (
SELECT *
FROM B
WHERE B.column_Q = A.column_Q
);

Related

fetch id from table1 based on some conditions and check if that id exists in other table

I have 2 tables; alternate identifier table and a master table
the above image represents the column from alternate identifiers table
and master table have these columns
Now, First I fetch company_group_id from alternate identifier table where bank_entity_id='somevalue' and id_value = 'somevalue';
if this query return nothing than end. if this query return company_group_id than I will check that company_group_id in master table where company_group_id = selected company group id.
after getting this if its present in the table than i will check hashcode if it presents in the master table.
separate queries are like this:
select company_group_id from aes_batch.aes_company_group_alternate_identifiers
WHERE ID_VALUE = '525' and BANK_ENTITY_ID='UOBS';
select company_group_id, hashcode from aes_batch.aes_company_group_master where company_group_id = 'value from the last query' and hashcode="value";
I want to combine these queries to get same result.
this is what I tried but failed.
SELECT t1.company_group_id
FROM aes_batch.aes_company_group_alternate_identifiers t1
LEFT JOIN aes_batch.aes_company_group_master t2
ON t1.company_group_id = t2.company_group_id
WHERE t2.company_group_id IS NULL;
SELECT *
FROM aes_batch.aes_company_group_master B
WHERE NOT EXISTS (SELECT 1
FROM aes_batch.aes_company_group_alternate_identifiers A
WHERE B.company_group_id = A.company_group_id);
Select a.company_group_id, b.company_group_id,
b.hashcode, a.id_value
from aes_batch.aes_company_group_alternate_identifiers a
LEFT JOIN aes_batch.aes_company_group_master b
ON b.company_group_id = a.company_group_id
WHERE a.id_value in ('524','525')
and a.bank_entity_id='UOBS';
can someone help me in this?

How to check in MySQL whether the result of one SELECT contains another SELECT?

I have tables
CREATE TABLE one (
op INT,
value INT
);
and
CREATE TABLE two (
tp INT,
value INT
);
Now I want to get all op values for which the set of values for the op contains all values for a given tp.
I would write this as:
SELECT op FROM one AS o1 WHERE (
(SELECT value FROM one AS o2 WHERE o1.op = o2.op)
CONTAINS ALL
(SELECT value FROM two WHERE tp=<specific-value>)
)
Unfortunately, I couldn't find such a CONTAINS ALL operator and nothing which would be close that.
Table one contains 50M entries, table two contains 1M entries. On average, there are 20 different values for a single op and tp.

Consider your tables name ops and tps.
SELECT
ops.op
FROM ops
INNER JOIN tps ON tps.value = ops.value
WHERE tps.tp = 1
GROUP BY ops.op
HAVING COUNT(DISTINCT ops.value) = (SELECT COUNT(DISTINCT tps.value) FROM tps WHERE tps.tp = 1); --- You can replace 1 with any tp value.

Select all from table except the records from a file

I have a table A with one column named a, and a file "test.txt" contains:
111111AAAA
222222BBBB
3333DDDDDD
.....
The records in test.txt have the same type with "a" column.
How to select all from A except the records in "test.txt"?
Update:
I tried 3 ways and the results not equal. What a strange!
// 7073 records -- Using NOT IN
SELECT * from mt_users WHERE TERMINAL_NUMBER_1 NOT IN (SELECT TERMINAL_NUMBER FROM A);
// 7075 records -- Using NOT EXISTS
SELECT * from mt_users WHERE NOT EXISTS (SELECT 1 FROM A WHERE A.TERMINAL_NUMBER = mt_users.TERMINAL_NUMBER_1);
// 7075 records -- Using LEFT JOIN
SELECT * FROM mt_users m LEFT JOIN A a ON m.TERMINAL_NUMBER_1 = a.TERMINAL_NUMBER WHERE a.TERMINAL_NUMBER IS NULL;

Firstly put all records from file into the newTable and make sure that there are no additional spaces at the beginning or the end in each field.
select a from tableA t where not exists(select 1 from newTable n where n.a = t.a)

Step 1. Put the records from test.txt into a different table.
Step 2.
SELECT a from tableA WHERE a NOT EXISTS (SELECT a FROM newTable)

doing what aF wrote would be my first answer too. if you cant/do not want to do that try "NOT IN" like:
SELECT a FROM A WHERE a NOT IN(...)
You have to generate the content of the () in the code where you create your query

sql query for deleting rows with NOT IN using 2 columns

I have a table with a composite key composed of 2 columns, say Name and ID. I have some service that gets me the keys (name, id combination) of the rows to keep, the rest i need to delete. If it was with only 1 row , I could use
delete from table_name where name not in (list_of_valid_names)
but how do I make the query so that I can say something like
name not in (valid_names) and id not in(valid_ids)
// this wont work since they separately dont identity a unique record or will it?

Use mysql's special "multiple value" in syntax:
delete from table_name
where (name, id) not in (select name, id from some_table where some_condition);
If your list is a literal list, you can still use this approach:
delete from table_name
where (name, id) not in (select 'john', 1 union select 'sally', 2);

Actually, no I retract my comment about needing special juice or being stuck with (AND OR'ing all your options).
Since you have a list of values of what you want to retain, dump that into a temporary table. Then do a delete against the base table for what does not exist in the temporary table (left outer join). I suck at mysql syntax or I'd cobble together your query. Psuedocode is approximate
DELETE
B
FROM
BASE B
LEFT OUTER JOIN
#RETAIN R
ON R.key1 = B.key1
AND R.key2 = B.key
WHERE
R.key1 IS NULL

The NOT EXISTS version:
DELETE
b
FROM
BaseTable b
WHERE
NOT EXISTS
( SELECT
*
FROM
RetainTable r
WHERE
(r.key1, r.key2) = (b.key1, b.key2)
)

INSERTing rows that is not in a table

I'm using this query but it is really really slow
INSERT INTO a (b,c,d,e,f,g,h,i) SELECT b,c,d,e,f,g,h,i FROM z WHERE b NOT IN (SELECT b FROM a)
What is does is find all records where b is not in table "a" from table z and importing it into table a.
Its really really slow and keeps timing. Is there away to make it quicker?
Thank-you
BigThings
P.s.

Make the b column unique, then INSERT with the IGNORE option, so:
INSERT IGNORE INTO a (b,c,d,e,f,g,h,i)
SELECT b,c,d,e,f,g,h,i FROM z

INSERT INTO a (b,c,d,e,f,g,h,i) SELECT a.b,a.c,a.d,a.e,a.f,a.g,a.h,a.i FROM z,a WHERE z.b != a.b

INSERT INTO a (b,c,d,e,f,g,h,i) SELECT b,c,d,e,f,g,h,i FROM z WHERE NOT EXISTS (SELECT 1 FROM a WHERE z.b = a.b)

Use this simple trick:
INSERT INTO a (b,c,d,e,f,g,h,i)
SELECT b,c,d,e,f,g,h,i
FROM z
LEFT JOIN a on a.b = z.b
WHERE a.b IS NULL;
You'll only get a row when there isn't a matching row in b, and the query will be able to use indexes effectively.