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;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(*)>1duplicate a column in sql
ALTER TABLE Table1
ADD SubCategory2 {Type of subcategory 1} {NULL|NOT NULL}
UPDATE Table1 SET SubCategory2 = SubCategory;Copyright © 2021 Codeinu
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