Insert SQL data into table by copying values from the same table - sql

Question

I have the following tables and trying to insert data into table T2 by copying from the same table if the name is Similar.
For Example, If T2 Has Name Red Then Copy ID and Name from T1 along with T2 Field.
TABLE T1
ID| NAME
5 RED T
6 BLUE T
TABLE T2
ID| NAME| FIELD 1| FIELD 2|FIELD 3
1 RED 17 20 23
2 RED 10 15 9
3 BLUE 7 8 3
EXPECTED OUTCOME:
TABLE T3
ID| NAME| FIELD 1| FIELD 2|FIELD 3
1 RED 17 20 23
1 RED 10 15 9
5 RED T 17 20 23
5 RED T 10 15 9
3 BLUE T 7 8 3
6 BLUE T 7 8 3
Here is what I have tried:
Insert into T1
Select ID, Name, Field1, Field2, Field3 From T2 a
Left Join T1 b
On a.Name like b.name

Answer 1

INSERT INTO T2 ([NAME], FIELD1, FIELD2, FIELD3)
SELECT T1.NAME, FIELD1, FIELD2, FIELD3
FROM T2 LEFT JOIN T1 ON T1.NAME LIKE CONCAT("%", T2.NAME ,"%")

Answer 2

You mentioned inserting into T2 but results displayed T3 so I went with T3 for now. If you really only want the records that weren't already in T2 then you can omit the UNION to the second part. Since you said that 'containing' is the same as 'similar' for your purposes:
CREATE TABLE T1
(
ID INT,
NAME VARCHAR(20)
);
INSERT INTO T1 VALUES (5, 'RED T');
INSERT INTO T1 VALUES (6, 'BLUE T');
CREATE TABLE T2
(
ID INT,
NAME VARCHAR(20),
FIELD1 INT,
FIELD2 INT,
FIELD3 INT
);
INSERT INTO T2 VALUES (1,'RED',17,20,23);
INSERT INTO T2 VALUES (2,'RED',10,15,9);
INSERT INTO T2 VALUES (3,'BLUE',7,8,3);
INSERT INTO T3(ID, NAME, FIELD1, FIELD2, FIELD3)
SELECT T1.ID, T1.NAME, T2.FIELD1, T2.FIELD2, T2.FIELD3
FROM T1 INNER JOIN T2 ON T1.NAME LIKE '%'||T2.NAME||'%'
UNION
SELECT T2.ID, T2.NAME, T2.FIELD1, T2.FIELD2, T2.FIELD3
FROM T2
ORDER BY ID

Answer 3

I think your problem is due the the fact that 'RED T' is not like 'RED'
You could try
Insert into T1
Select ID, Name, Field1, Field2, Field3 From T2 a
Left Join T1 b
On a.Name like ('%' + b.name + '%')
...But this is not generic or at least it could not match all the cases you would expect.
As others said you should specify more clearly what you mean by "similar".

Answer 4

Below would be the possible query
Insert into T1 (ID, Name, Field1, Field2, Field3)
Select t.ID, t.Name, t2.Field1, t2.Field2, t2.Field3
From T1 t Left outer join T2 t2 on
substring(t.Name,1,CHARINDEX(' ', t.Name))=t2.Name
Apologies for possible syntax mismatch as I didn't execute it and entered the solution via phone
The solution I have proposed is based on the assumption that in T1 the matching colour should be the first part then a space and finally last part