How can I compare two tables in SQL?

How can I compare two tables in SQL?

Compare Two Tables using UNION ALL Select * from ( Select Id_pk, col1, col2…,coln from table1, ‘Old_table’ Union all Select Id_pk, col1, col2…,coln from table2, ‘New_tbale’ ) cmpr order by Id_pk; The above query returns the all rows from both tables as old and new.

How do you compare two columns values in two different tables in SQL?

Using joins to compare columns by priority among the table. For example, left join returns all values from the first table and null value for the not-matched records from the second table. Similarly, we can use right join, inner join, full join and self join as per our requirements.

How can I compare the column names of two tables in SQL Server?

Lets write a below SQL query to compare column name between these two tables. SELECT * into #tblA FROM information_schema. columns WHERE table_Schema =’dbo’ and table_name = ‘TableA’ ; SELECT * into #tblB FROM information_schema. columns WHERE table_Schema =’dbo’ and table_name = ‘TableB’ ; SELECT COALESCE(A.

Can we compare two columns in SQL?

Answer. Yes, within a WHERE clause you can compare the values of two columns. When comparing two columns in a WHERE clause, for each row in the database, it will check the value of each column and compare them.

On the SQL menu,point to Data Compare,and then click New Data Comparison.

Identify the source and target databases.

Select the check boxes for the tables and views that you want to compare.

If more than one key is present,you can use the Comparison Key column to specify the key on which to base the data comparison.

Click Finish.

How to compare two tables in SQL efficiently?

Introduction.

Setting up a test environment.

Set-based operations.

Challenges with non-keyed tables.

Giving our tables something in common.

Row-to-row changes.

Checking comparability with sys.columns.

Creating differences.

Computing basic statistics.

Using SELECT…EXCEPT to find column differences.

How to view all the tables in SQL?

In the Connections navigator in SQL Developer,navigate to the Tables node for the schema that includes the table you want to display.

Open the Tables node. The list of tables in the schema appears.

Click the name of the table that you want to display. A tab with the table name appears in the object pane,with the Columns subtab displayed.

How to find a table in SQL?

User Owned Tables. To see tables owned by the currently logged-in user,you can query the user_tables view.

User Accessible Tables. To see all tables that the current user can access,you can query the all_tables view.

All Database Tables.

DBA_TABLES and DBA_VIEWS

ALL_TABLES and ALL_VIEWS

USER_TABLES and USER_VIEWS.