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Does Big Query support operations like "REPLACE INSERT" or something related to that?
If I run a query like this twice:
INSERT INTO table(column1) VALUES(1)
It'll create a duplicated row, is it possible to insert a row only if a column with the same value does not exist?
Thanks!
377
There are three ways you can perform an “insert if not exists” query in MySQL: Using the INSERT IGNORE statement. Using the ON DUPLICATE KEY UPDATE clause. Or using the REPLACE statement.
COALESCE. Returns the value of the first non-null expression. The remaining expressions are not evaluated. An input expression can be any type.
It is also possible to only insert data in specific columns.
There are three ways you can perform an “insert if not exists” query in MySQL: Keep in mind that before you create an insert if not exists query, the MySQL table in use must already have one or more column (s) with PRIMARY KEY or UNIQUE constraint.
The table would look like the following: Using such table as example, an INSERT...SELECT to implement the insert-if-not-exists logic would look like: The first SELECT will create a virtual table with the data we want to insert. One or more rows can be created with that technique (it works very nicely up to a few hundred rows.
MySQL doesn’t have a statement to insert a new row if the data do not exist. This is because when you have table column (s) with PRIMARY KEY or UNIQUE constraint, then MySQL will throw an error each time your query inserts a new row with duplicate values for those columns.
INSERT query follows the standard SQL syntax. The values that are being inserted should be used in the same order as the columns. The below image shows an example of INSERT command You can execute a basic INSERT query with columns specified as below. An INSERT query without specifying columns can be executed as below.
Below should make it
#standardSQL
INSERT INTO yourTable(column1)
SELECT value FROM (SELECT 1 AS value)
LEFT JOIN yourTable
ON column1 = value
WHERE column1 IS NULL
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