How do I get the same value in a column in SQL?
How to Find Duplicate Values in SQL
- Using the GROUP BY clause to group all rows by the target column(s) – i.e. the column(s) you want to check for duplicate values on.
- Using the COUNT function in the HAVING clause to check if any of the groups have more than 1 entry; those would be the duplicate values.
How do I get the most repeated values in SQL?
9 Answers. SELECT
How do I select the same row multiple times in SQL?
Answer #2: You can use the UNION ALL statement. You’d have to repeat the SELECT statement a bunch of times but you could write a bit of VB code in Access to create a dynamic SQL statement and then execute it.
How do I find duplicate values in two columns in MySQL?
Find Duplicate Row values in Multiple Columns
SELECT col1, col2,…, COUNT(*) FROM table_name GROUP BY col1, col2, … HAVING (COUNT(col1) > 1) AND (COUNT(col2) > 1) AND … In the above query, we do a GROUP BY of all the columns (col1, col2) for whom we want to find duplicates.
How do I check if two columns have the same value in SQL?
Here’s the generic SQL query to two compare columns (column1, column2) in a table (table1). mysql> select * from table1 where column1 not in (select column2 from table1); In the above query, update table1, column1 and column2 as per your requirement.
Can you group by multiple columns in SQL?
SQL GROUP BY multiple columns is the technique using which we can retrieve the summarized result set from the database using the SQL query that involves grouping of column values done by considering more than one column as grouping criteria.
How do you use DESC?
When sorting your result set in descending order, you use the DESC attribute in your ORDER BY clause. For example: SELECT last_name FROM employees WHERE first_name = ‘Sarah’ ORDER BY last_name DESC; This SQL Server ORDER BY example would return all records sorted by the last_name field in descending order.
Can you use select multiple times in SQL?
You’d have to repeat the SELECT statement a bunch of times but you could write a bit of VB code in Access to create a dynamic SQL statement and then execute it.
How do I have multiple rows in one row in SQL?
STUFF Function in SQL Server
- Create a database.
- Create 2 tables as in the following.
- Execute this SQL Query to get the student courseIds separated by a comma. USE StudentCourseDB. SELECT StudentID, CourseIDs=STUFF. ( ( SELECT DISTINCT ‘, ‘ + CAST(CourseID AS VARCHAR(MAX)) FROM StudentCourses t2.
What is the difference between union and union all SQL?
The only difference between Union and Union All is that Union extracts the rows that are being specified in the query while Union All extracts all the rows including the duplicates (repeated values) from both the queries.
How do I find duplicate records in the same table in MySQL?
13 Answers. You can use a grouping across the columns of interest to work out if there are duplicates. SELECT artist, release_id, count(*) no_of_records, group_concat(id) FROM table GROUP BY artist, release_id HAVING count(*) > 1; also adding group_concat(id) gets you all ids of the duplicates.
How do I find duplicate records in two tables in SQL?
Check for Duplicates in Multiple Tables With INNER JOIN
Use the INNER JOIN function to find duplicates that exist in multiple tables. Sample syntax for an INNER JOIN function looks like this: SELECT column_name FROM table1 INNER JOIN table2 ON table1. column_name = table2.
How do I stop inserting duplicate records in MySQL?
Note − Use the INSERT IGNORE command rather than the INSERT command. If a record doesn’t duplicate an existing record, then MySQL inserts it as usual. If the record is a duplicate, then the IGNORE keyword tells MySQL to discard it silently without generating an error.