Is it possible to query from external database? [duplicate]

1. How do I query duplicate records in SQL?
2. Can you query multiple databases?
3. How can we find duplicate records in a table?
4. How do I create a duplicate database using mysql query?
5. How do you eliminate duplicate rows in SQL query without distinct?
6. How do you avoid duplicate queries in SQL insert?
7. Can you query two different databases SQL?
8. How use multiple databases in SQL query?
9. How do I search multiple databases at once?
10. How do I check for duplicate entries in Excel?
11. Which command will fetch only one copy of the duplicate records?
12. How do I find duplicate rows in SQL using Rowid?

How do I query duplicate records in SQL?

To select duplicate values, you need to create groups of rows with the same values and then select the groups with counts greater than one. You can achieve that by using GROUP BY and a HAVING clause.

Can you query multiple databases?

How to Run a SQL Query Across Multiple Databases with One Query. In SQL Server management studio, using, View, Registered Servers (Ctrl+Alt+G) set up the servers that you want to execute the same query across all servers for, right click the group, select new query.

How can we find duplicate records in a table?

SQL Query to find duplicate records in a table in MySQL

1. mysql> select * from Contacts;
2. mysql> select name, count(name) from contacts group by name;
3. mysql> select name, count(name) from contacts group by name, phone;

How do I create a duplicate database using mysql query?

To copy a MySQL database, you need to follow these steps:

1. First, create a new database using CREATE DATABASE statement.
2. Second, export all the database objects and data of the database from which you want to copy using mysqldump tool.
3. Third, import the SQL dump file into the new database.

How do you eliminate duplicate rows in SQL query without distinct?

Below are alternate solutions :

1. Remove Duplicates Using Row_Number. WITH CTE (Col1, Col2, Col3, DuplicateCount) AS ( SELECT Col1, Col2, Col3, ROW_NUMBER() OVER(PARTITION BY Col1, Col2, Col3 ORDER BY Col1) AS DuplicateCount FROM MyTable ) SELECT * from CTE Where DuplicateCount = 1.
2. Remove Duplicates using group By.

How do you avoid duplicate queries in SQL insert?

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.

Can you query two different databases SQL?

Multiple Databases on One Server Instance

It is possible to use SQL to write one query that combines the information from many databases. There are two requirements: You must prefix all table references with the database name (e.g. customers. customer instead of just customer).

How use multiple databases in SQL query?

Join Tables from Different Databases in SQL Server

1. Step 1: Create the first database and table. To start, create the first database called Database_1: CREATE DATABASE Database_1. ...
2. Step 2: Create the second database and table. ...
3. Step 3: Join the tables from the different databases in SQL Server. ...
4. Step 4 (optional): Drop the databases created.

How do I search multiple databases at once?

Once you have opened Academic Search Complete, click on the "Choose Databases" link above the search textbox. Next, select the databases you want to search or simply click in the box next to "Select / Deselect All" and then click on OK and do your search!

How do I check for duplicate entries in Excel?

Find and remove duplicates

1. Select the cells you want to check for duplicates. ...
2. Click Home > Conditional Formatting > Highlight Cells Rules > Duplicate Values.
3. In the box next to values with, pick the formatting you want to apply to the duplicate values, and then click OK.

Which command will fetch only one copy of the duplicate records?

Discussion Forum

How do I find duplicate rows in SQL using Rowid?

Use the rowid pseudocolumn. DELETE FROM your_table WHERE rowid not in (SELECT MIN(rowid) FROM your_table GROUP BY column1, column2, column3); Where column1 , column2 , and column3 make up the identifying key for each record. You might list all your columns.