LAST_INSERT_ID returns 0 in an insert query

Question

Please I am trying to insert the last ID into a different column of the same row in mysql. This is what i have tried

 Insert Query

"INSERT INTO table(char,name) VALUES (LAST_INSERT_ID(),'KOKO')"

This is the Output
ID  |   char    |   name    |
1   |    0      |   KOKO    |

HOWEVER, I expect that when a row is inserted the column char will insert the ID value as well; What i expect

    ID  |   char    |   name    |
    1   |    1      |   KOKO    |

Please is there something i am doing wrong. Will be glad to know, thanks in advance

Answer 1

You can't use LAST_INSERT_ID() and insert in the same transaction because LAST_INSERT_ID() do not know value of the last insert id before insert
Please try to use update:

INSERT INTO table(char,name) VALUES (0,'KOKO')
UPDATE table
SET char = LAST_INSERT_ID()
WHERE ID = LAST_INSERT_ID()

Answer 2

According to MySQL documentation the LAST_INSERT_ID() returns a generated value that was set for an AUTO_INCREMENT column by the most recently executed INSERT statement. Therefore you need this sequence: insert -> get last insert id -> update. Here is code:

INSERT INTO table (char, name) VALUES (0, 'KOKO')

UPDATE table SET `char` = LAST_INSERT_ID() WHERE `ID` = LAST_INSERT_ID()

But it turns out that the column char duplicates column ID which possibly indicates wrong DB structure.