How to select rows that have the same value in two columns?

How to select rows that have the same value in two columns?

CREATE VIEW DUP_CARDS AS SELECT CARDNUMBER, MEMBERTYPE FROM mytable t2 GROUP BY CARDNUMBER, MEMBERTYPE HAVING COUNT (*) > 1 CREATE VIEW DUP_ROWS AS SELECT t1.* FROM mytable AS t1 INNER JOIN DUP_CARDS AS DUP ON (T1.CARDNUMBER = DUP.CARDNUMBER AND T1.MEMBERTYPE = DUP.MEMBERTYPE )

How to allow two columns to have equal values?

Besides triggers, you could allow the two columns to have equal values and simply ignore the rows by accessing the table always through a view: Alternatively, you can restrict Insert and Update operations through (stored) procedures that take care of the constraint and not allow data to be inserted (or changed) that do not satisfy it.

Can you add check constraint to mysql table?

No, you can’t. In most DBMS (Postgres, SQL-Server, Oracle, DB2 and many others), you can just add a CHECK constraint: I don’t see any way to have this in MySQL, using only referential constraints. Besides triggers, you could allow the two columns to have equal values and simply ignore the rows by accessing the table always through a view:

How to select different columns from same table in MySQL?

My MySQL skills are very basic, so What I need (if possible) is a single SELECT statement that selects different columns from different rows in the same table. Most Google comes up with has to do with combining different tables or selecting same columns from different rows.

How to compare two columns with same content in Excel?

To find cells within the same row having the same content, A2 and B2 in this example, the formula is as follows: =IF (A2=B2,”Match”,””) Formula for differences. To find cells in the same row with different content, simply replace “=” with the non-equality sign: =IF (A2<>B2,”No match”,””) Matches and differences.

Is there a way to highlight row differences in Excel?

Highlight row differences and matches in multiple columns. When comparing values in several columns row-by-row, the quickest way to highlight matches is creating a conditional formatting rule, and the fastest way to shade differences is embracing the Go To Special feature, as demonstrated in the following examples.

How do you select columns from a table in SQL?

Every SQL query begins with a SELECT clause, leading some to refer to queries generally as SELECT statements. After the SELECT keyword comes a list of whatever columns you want returned in the result set. These columns are drawn from the table specified in the FROM clause.

How to select 10, 000 rows in a table?

There are 10,000 rows in the table. I need to be able to select all productID having colorID 2 and colorID 5. For example: Using this data set I am looking for productID 3, since it is the only productID that has colorID 2 AND colorID 5 (it also has colorID 6, but I don’t care about that) Using WHERE colorID=2 AND colorID=6 returns 0 rows.

How to select rows with same ID but different liefnr?

I would like to select the ARIDNR that occurs more than once with the different LIEFNR. The output should be something like: The idea is to use the inner query to identify the records which have a ARIDNR value that occurs 1+ times in the data, then get all columns from the same table based on that set of values.