“SQL löschen doppelte Zeilen” Code-Antworten

SQL Count Dopplicate Zeilen

SELECT _column, COUNT(*) 
FROM _table
GROUP BY _column
HAVING COUNT(*) > 1
Thibaudkhan

T-SQL erhalten doppelte Zeilen

SELECT [CaseNumber], COUNT(*) AS Occurrences
FROM [CaseCountry]
GROUP BY [CaseNumber]
HAVING (COUNT(*) > 1)
kwils1997

Dublict -Zeilen SQL löschen

WITH CTE AS(
   SELECT [col1], [col2], [col3], [col4], [col5], [col6], [col7],
       RN = ROW_NUMBER()OVER(PARTITION BY col1 ORDER BY col1)
   FROM dbo.Table1
)
DELETE FROM CTE WHERE RN > 1
uzii

SQL Duplikate entfernen

WITH cte AS (
    SELECT 
        contact_id, 
        first_name, 
        last_name, 
        email, 
        ROW_NUMBER() OVER (
            PARTITION BY 
                first_name, 
                last_name, 
                email
            ORDER BY 
                first_name, 
                last_name, 
                email
        ) row_num
     FROM 
        sales.contacts
)
DELETE FROM cte
WHERE row_num > 1;
/*
Code language: SQL (Structured Query Language) (sql)

In this statement:

First, the CTE uses the ROW_NUMBER() function to find the duplicate rows 
specified by values in the first_name, last_name, and email columns.

Then, the DELETE statement deletes all the duplicate rows but keeps only one 
occurrence of each duplicate group.*/
Lucas Gomes

Wie man ohne doppelte Zeilen in SQL abfragt

SELECT DISTINCT col1,col2... FROM table_name where Condition;
VeNOM

SQL löschen doppelte Zeilen

WITH cte AS (
    SELECT 
        contact_id, 
        first_name, 
        last_name, 
        email, 
        ROW_NUMBER() OVER (
            PARTITION BY 
                first_name, 
                last_name, 
                email
            ORDER BY 
                first_name, 
                last_name, 
                email
        ) row_num
     FROM 
        sales.contacts
)
DELETE FROM cte
WHERE row_num > 1;
Dead Dotterel

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