MySQL Insert Where query

Question

What\'s wrong with this query:

INSERT INTO Users( weight, desiredWeight ) VALUES ( 160, 145 ) WHERE id = 1;

It works without the WHE

Answer 1

its totall wrong. INSERT QUERY does not have a WHERE clause, Only UPDATE QUERY has it. If you want to add data Where id = 1 then your Query will be

UPDATE Users SET weight=160, desiredWeight= 145 WHERE id = 1;

Answer 2

I think that the correct form to insert a value on a specify row is:

UPDATE table SET column = value WHERE columnid = 1

it works, and is similar if you write on Microsoft SQL Server

INSERT INTO table(column) VALUES (130) WHERE id = 1;

on mysql you have to Update the table.

Answer 3

DO READ THIS AS WELL

It doesn't make sense... even literally

INSERT means add a new row and when you say WHERE you define which row are you talking about in the SQL.

So adding a new row is not possible with a condition on an existing row.

You have to choose from the following:

A. Use UPDATE instead of INSERT

B. Use INSERT and remove WHERE clause ( I am just saying it...) or if you are real bound to use INSERT and WHERE in a single statement it can be done only via INSERT..SELECT clause...

INSERT INTO Users( weight, desiredWeight ) 
SELECT FROM Users WHERE id = 1;

But this serves an entirely different purpose and if you have defined id as Primary Key this insert will be failure, otherwise a new row will be inserted with id = 1.

Answer 4

You can't use INSERT and WHERE together. You can use UPDATE clause for add value to particular column in particular field like below code;

UPDATE Users
SET weight='160',desiredWeight ='145'  
WHERE id =1

Answer 5

The right answer to this question will be sth like this:

a). IF want select before insert :

INSERT INTO Users( weight, desiredWeight ) 
  select val1 , val2  from tableXShoulatNotBeUsers
  WHERE somecondition;

b). IF record already exists use update instead of insert:

 INSERT INTO Users( weight, desiredWeight ) VALUES ( 160, 145 ) WHERE id = 1;

Should be

Update Users set weight=160, desiredWeight=145  WHERE id = 1;

c). If you want to update or insert at the same time

Replace Users set weight=160, desiredWeight=145  WHERE id = 1;

Note):- you should provide values to all fields else missed field in query 
        will be set to null

d). If you want to CLONE a record from SAME table, just remember you cann't select from table to which you are inserting therefore

 create temporary table xtable ( weight int(11), desiredWeight int(11) ;

 insert into xtable (weight, desiredWeight) 
    select weight, desiredWeight from Users where [condition]

 insert into Users (weight, desiredWeight) 
    select weight , desiredWeight from xtable;

I think this pretty covers most of the scenarios

Answer 6

It depends on the situation INSERT can actually have a where clause.

For example if you are matching values from a form.

Consider INSERT INTO Users(name,email,weight, desiredWeight) VALUES (fred,bb@yy.com,160,145) WHERE name != fred AND email != bb@yy.com

Makes sense doesn't it?