Compare two table in mysql

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I have two tables. One table (table1) has 28500 rows and the other (table2) has 17450 rows. I would like to compare these tables and find rows that do not exist in table1.

SELECT * FROM table1 WHERE ID NOT IN (SELECT DISTINCT(ID) FROM table2)

Any suggestions?

Try this:

SELECT table1.*
FROM table1
LEFT OUTER JOIN table2
ON table1.id = table2.id
WHERE table2.id IS NULL

LEFT OUTER JOIN link two table starting by table1, if table2 has no linked row all fields of table2 will be null. So, if you put in your WHERE condition table2.id is null, you get only rows in table1 not existing in table2

Compare two table in mysql, Try this: SELECT table1.* FROM table1 LEFT OUTER JOIN table2 ON table1.id = table2.id WHERE table2.id IS NULL. LEFT OUTER JOIN link  The second way to combine tables in MySQL is to use the OUTER JOIN. In the OUTER  JOIN, all data in one table will be displayed, while the data in another table will only be displayed if the data is in the first table. In MySQL, the OUTER JOIN has two types, namely the LEFT OUTER JOIN and RIGHT OUTER JOIN.

You could solve this by doing a left outer join and checking for all rows that don't exist. Try the following depending on if you want to find values not existent from table1 in table2 or table2 in table1.

SELECT *
FROM table1
LEFT OUTER JOIN table2 ON (table1.id = table2.id)
WHERE table2.id IS NULL;


SELECT *
FROM table2
LEFT OUTER JOIN table1 ON (table1.id = table2.id)
WHERE table2.id IS NULL;

SQL Fiddle: http://sqlfiddle.com/#!2/a9390/8

Mysql compare two tables and display only the difference, Use NOT EXISTS select * from table2 A Where Not exists (select 1 from table1 B Where A.ID = B.value). Or LEFT OUTER JOIN select * from  MySQL: Compare two similar tables to find unmatched records Sometimes you have two tables with similar structures and want to compare them. One could be the table in an older schema on an old server and the other one the newer schema on a new server. Let’s say you move data from one server to the other and want to check the data.

Try this:

SELECT id, name
FROM (
SELECT id, name FROM table1
UNION ALL
SELECT id, name FROM table2
) tbl
GROUP BY id, name
HAVING count(*) = 1
ORDER BY id;

Suppose you have two tables table1 and table2 with same columns and values. If any one table has any extra row then using below query you can get the unmatched results.

Read: Compare two tables in MySQL

Sql statement to compare two table, To get the differences both ways you need to perform the UNION of 3 mysql> create table product1(product varchar(50),price float); Query OK  How To Compare Successive Rows Within The Same Table in MySQL Summary : in this tutorial, we will show you how to compare successive rows within the same table using the self-join technique. Suppose you have a table called inventory with the structure defined by the CREATE TABLE statement as follows:

Make use of this query:

SELECT 
    * 
FROM 
    table2 
LEFT JOIN 
    table1
ON 
    table2.primary_key = table1 .primary_key
WHERE 
    table1 .primary_key IS NULL
;

MySQL: Compare two similar tables to find unmatched records , Sometimes you have two tables with similar structures and want to compare them​. One could be the table in an older schema on an old server  You can compare the two similar tables or data sets using MINUS operator. It returns all rows in table 1 that do not exist or changed in the other table. Select Id_pk, col1, col2,coln from table1 MINUS Select Id_pk, col1, col2,coln from table2;

well, if you want the answer in PHP, then here is it:

$sql=mysql_query("SELECT * FROM table1");
while($row=mysql_fetch_array($sql))
{
    $id=$row['id'];
    $sql2=mysql_query("SELECT * FROM table2 WHERE id='$id'");
    $check=mysql_num_rows($sql2);
    if($check==0)
    {
        echo $id." is not in table1<br>";
    }
}

I hope this help you

Comparing Tables and Columns in MySQL - Querychat, In MySQL, we can compare tables and columns at the record level by looking at statement will use column names in parentheses to connect the two tables. If you want to compare 2 tables by all columns (full compare, not just by single specific column like ID) you can use this approach: SELECT column1, column2, column3 FROM ( SELECT t1.column1, t1.column2, t1.column3 FROM t1 UNION ALL SELECT t2.column1, t2.column2, t2.column3 FROM t2 ) t GROUP BY column1, column2, column3 HAVING COUNT(*) = 1 ORDER BY column3

How to compare differences between MySQL tables, If I have two identical mysql tables (same name, same fields etc) how can I compare if the data is the same from each row? Compare SQL Server Data in Tables Using the Tablediff Tool There is a nice command line tool used to compare tables. This can be found in "C:\Program Files\Microsoft SQL Server\110\COM\" folder. This command line tool is used to compare tables.

How to compare two tables that have a unique or same content in , Originally Answered: How do I compare two tables that have unique or same content in mysql? You can do this using JOINS in sql.There different joins available  Specify the needed connections to MySQL servers in the Connection fields. Select the databases you want to compare in the Database fields. Note, if you want to compare tables in the same database, you may just select Source connection and database and then just click the Copy source settings to target button.

Compare two MySQL databases for any differences, Evaluate table row counts: ensure that the two database tables have similar row numbers. Evaluate table data uniformity: it ensures both the  MySQL Forums Forum List Compare two rows in same table. Robert Bruguera. July 22, 2009 10:32PM Re: Compare two rows in same table. laptop alias. July 23, 2009 03:45AM

Comments
  • can you post your table structure?
  • Doesn't your query work...
  • @ahmadalbayati OP has not describe that OP is using PHP or not.
  • @Broken Heart so i may not post my possible answer which is in PHP
  • Are you sure that ID is available in both table ?
  • what this means SELECT table1.*
  • All fields of table1
  • table2.id = NULL is not correct, please use IS NULL when you compare a field with a NULL value
  • This is a bad approach as if you have thousands of rows in table1 you will iterate over each one when running query of table2. It is extremely not efficient
  • True. Tells alot about me 5 years ago :D
  • Hahah... you are right, I am also feels like that when looking back at my previously written code. It means we are growing in our skills ;)
  • Yea, we are :-)