How to insert DECIMAL into MySQL database

Question

I have a database table with some fields  one of them  cost  is set to the DECIMAL data type  I set the parameters to 4 2  which should allow 4 numbers before the decimal point  and 2 afterwards    I ve been told that the 4 here is the total amount  and the 2 is the amount after the decimal  could somebody please clear that up on a side note    When I insert data via a POST request  the value 3 80 for example  the data stored to my database is actually 99 99   What am I doing wrong to cause this   Here s the table   CREATE TABLE IF NOT EXISTS  mytable     id  int 11  NOT NULL AUTO INCREMENT   title  varchar 256  NOT NULL   cost  decimal 4 2  NOT NULL  PRIMARY KEY   id       Here s my add query   INSERT INTO mytable   id   title   cost    VALUES  0   test title    3 80     Update  It works after I changed 4 2 to 6 2

User · Answer

I noticed something else about your coding.... look

INSERT INTO reports_services (id,title,description,cost) VALUES (0, 'test title', 'test decription ', '3.80')

in your "CREATE TABLE" code you have the id set to "AUTO_INCREMENT" which means it's automatically generating a result for that field.... but in your above code you include it as one of the insertions and in the "VALUES" you have a 0 there... idk if that's your way of telling us you left it blank because it's set to AUTO_INC. or if that's the actual code you have... if it's the code you have not only should you not be trying to send data to a field set to generate it automatically, but the RIGHT WAY to do it WRONG would be

'0',

you put

0,

lol....so that might be causing some of the problem... I also just noticed in the code after "test description" you have a space before the '.... that might be throwing something off too.... idk.. I hope this helps n maybe resolves some other problem you might be pulling your hair out about now.... speaking of which.... I need to figure out my problem before I tear all my hair out..... good luck.. :)

UPDATE.....

I almost forgot... if you have the 0 there to show that it's blank... you could be entering "test title" as the id and "test description" as the title then "3.whatever cents" for the description leaving "cost" empty...... which could be why it maxed out because if I'm not mistaking you have it set to NOT NULL.... and you left it null... so it forced something... maybe.... lol

User · Answer

Yes  4 2 means  4 digits total  2 of which are after the decimal place   That translates to a number in the format of 00 00  Beyond that  you ll have to show us your SQL query  PHP won t translate 3 80 into 99 99 without good reason  Perhaps you ve misaligned your fields values in the query and are trying to insert a larger number that belongs in another field

User · Answer

MySql decimal types are a little bit more complicated than just left-of and right-of the decimal point   The first argument is precision  which is the number of total digits  The second argument is scale which is the maximum number of digits to the right of the decimal point   Thus   4 2  can be anything from -99 99 to 99 99   As for why you re getting 99 99 instead of the desired 3 80  the value you re inserting must be interpreted as larger than 99 99  so the max value is used  Maybe you could post the code that you are using to insert or update the table   Edit  Corrected a misunderstanding of the usage of scale and precision  per http   dev mysql com doc refman 5 0 en numeric-types html

[mysql] How to insert DECIMAL into MySQL database

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