finding duplicate column values in table with sql
SELECT username, email, COUNT(*)
FROM users
GROUP BY username, email
HAVING COUNT(*) > 1finding duplicate column values in table with sql
SELECT username, email, COUNT(*)
FROM users
GROUP BY username, email
HAVING COUNT(*) > 1sql how to duplicate a table
CREATE TABLE new_table LIKE original_table;
INSERT INTO new_table SELECT * FROM original_table;duplicate names in sql
• SELECT first_name, COUNT (first_name) FROM employees
GROUP BY first_name
HAVING (COUNT(first_name) > 1);duplicate table sql
/*
First step 1: Duplicate table in SQL (no data is coppied with)
*/
CREATE TABLE new_table LIKE original_table;
/*
Sec step 2 : Insert the data (copies the data from original to new)
*/
INSERT INTO new_table SELECT * FROM original_table;
/*Done!*/duplicate table sql
CREATE TABLE new_table LIKE original_table;FIND DUPLICATES IN COLUMN SQL
declare @YourTable table (id int, name varchar(10), email varchar(50))
INSERT @YourTable VALUES (1,'John','John-email')
INSERT @YourTable VALUES (2,'John','John-email')
INSERT @YourTable VALUES (3,'fred','John-email')
INSERT @YourTable VALUES (4,'fred','fred-email')
INSERT @YourTable VALUES (5,'sam','sam-email')
INSERT @YourTable VALUES (6,'sam','sam-email')
SELECT
name,email, COUNT(*) AS CountOf
FROM @YourTable
GROUP BY name,email
HAVING COUNT(*)>1Copyright © 2021 Codeinu
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