Your question: How do I add a column in SQL based on another column?

How do you UPDATE a column based on another column in SQL?

UPDATE table SET col = new_value WHERE col = old_value AND other_col = some_other_value; UPDATE table SET col = new_value WHERE col = old_value OR other_col = some_other_value; As you can see, you can expand the WHERE clause as much as you’d like in order to filter down the rows for updating to what you need.

How do I add a column to an existing table from another table in SQL?

2 Answers. First add the column with the appropriate datatype. ALTER TABLE table1 ADD COLUMN Age TINYINT UNSIGNED NOT NULL DEFAULT 0; Then update the table, so that the values are “transmitted”.

How do I add a column to a specific column in SQL Server?

First add the new column to the old table through SSMStudio. Go to the database >> table >> columns. Right click on columns and choose new column. Follow the wizard.

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How do I add data to an existing column in SQL?


It is possible to write the INSERT INTO statement in two ways: 1. Specify both the column names and the values to be inserted: INSERT INTO table_name (column1, column2, column3, …)

How do you UPDATE a column by joining two tables?

The most easiest and common way is to use join clause in the update statement and use multiple tables in the update statement.

  1. UPDATE table 1.
  2. SET Col 2 = t2.Col2,
  3. Col 3 = t2.Col3.
  4. FROM table1 t1.
  5. INNER JOIN table 2 t2 ON t1.Col1 = t2.col1.
  6. WHERE t1.Col1 IN (21,31)

How do you UPDATE a column from one table to another?


  1. First, specify the name of the table (t1) that you want to update in the UPDATE clause.
  2. Next, specify the new value for each column of the updated table.
  3. Then, again specify the table from which you want to update in the FROM clause.

How do I add a column from one table to another in MySQL?

How to Add Columns to a Table Using MySQL ADD COLUMN Statement

  1. First, you specify the table name after the ALTER TABLE clause.
  2. Second, you put the new column and its definition after the ADD COLUMN clause. …
  3. Third, MySQL allows you to add the new column as the first column of the table by specifying the FIRST keyword.

How can I add multiple values in one column in SQL?

The INSERT statement also allows you to insert multiple rows into a table using a single statement as the following: INSERT INTO table_name(column1,column2…) VALUES (value1,value2,…), (value1,value2,…), … In this form, you need to provide multiple lists of values, each list is separated by a comma.

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How do I add a column to a table in phpMyAdmin?

Adding a Column to an Already Existing Database Table in phpMyAdmin

  1. Log in to phpMyAdmin. …
  2. Once logged in, go to the left sidebar and click the name of the database table you want to add a column to. …
  3. Click Structure in the top navbar.
  4. Underneath your existing columns, there is a line: Add # Columns.

How do you add a column between?

Select the column heading to the right of where you want the new column to appear. For example, if you want to insert a column between columns D and E, select column E. Click the Insert command on the Home tab. The new column will appear to the left of the selected column.

Is it possible to add a column in between two columns?

in response to comments, yes, this is with SQL Server Management Studio through the UI, and under the hood, it’s doing the drop/recreate you’re trying to avoid, so no, you can’t do it without the server doing it for you.

How do you check if a column exists in SQL?

The easiest and straightforward way to check for the column in a table is to use the information schema for column system view. Wright a select query for INFORMATION_SCHEMA. COLUMNS as shown below. If the query returns record, then the column is available in the table.

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