Updating one table from another table in sql server 2016
Both the databases have the same structure, but different data.Database1 (Test1) is the latest, and database2 (Test2) is an old copy of the database.
So I need to update the table in the new DB from the table in the old DB which has around 1000 rows.the FROM clause – it does make it simple to understand and is a nice feature.Results after the update: a b c d ———————————— 1 x y z 2 a1 b1 c1 3 t x z DB2 LUW: –Same as Oracle– UPDATE TABLEA SET (b, c, d) = (SELECT b1, c1, d1 from TABLEB WHERE TABLEB.a1 = TABLEA.a and TABLEB.e1 40); Results after the update: a b c d ———————————— 1 x y z 2 a1 b1 c1 3 t x z NOTE: It is very important to make sure that your where clause for the update statement is correct since that is what identifies the records that the update statement is going to qualify and do the update upon.Therefore, we recommend that you avoid the 1: M relationship.Also, if the table you're updating is the same as the table in the FROM clause and the FROM clause contains only one reference to the table, an alias might not be specified.If the table you're updating appears more than once in the FROM clause, only one reference to the table can omit a table alias; all other references to the table must include a table alias.
UPDATE summary_data SET current_category = (SELECT category_id FROM products WHERE products.product_id = summary_data.product_id) WHERE EXISTS (SELECT category_id FROM products WHERE products.product_id = summary_data.product_id); If you want to test your skills using the SQL UPDATE statement, try some of our practice exercises.
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After the data is inserted, you will change the content of a row by using an UPDATE statement.
You will use the WHERE clause of the UPDATE statement to restrict the update to a single row. The basic syntax is: INSERT, table name, column list, VALUES, and then a list of the values to be inserted.
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