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I have the following query:
INSERT INTO LICENSE_TABLE (code, license_type, distributor) values ("uniquecode", "standard", "walmart")
I want to insert the row only if no row exists that already has
How can I do this?
I found some solutions involving
INSERT IGNORE, something about
DUAL, and a few more, but I did not understand which applies to my situation.
If it matters, I am using
The best way to do this uses
on duplicate key update:
First, you need a unique index, so the database maintains the data integrity.
INSERT INTO LICENSE_TABLE (code, license_type, distributor) VALUES ('uniquecode', 'standard', 'walmart') ON DUPLICATE KEY UPDATE code = VALUES(code);
This is better than a
WHERE subquery with
EXISTS because it is thread-safe. That means that multiple updates in different threads will not ever cause a problem.
This is better than
INSERT IGNORE because
INSERT IGNORE will ignore other errors.
ON DUPLICATE KEY UPDATE does exactly what you want.
MySQL: Insert record if not exists in table, INSERT doesn't allow WHERE in the syntax. What you can do: create a UNIQUE INDEX on the field which should be unique ( name ), then use either: normal INSERT (and handle the error if the name already exists) INSERT IGNORE (which will fail silently cause a warning (instead of error) if name already exists) Fastest way to insert new records where one doesn’t already exist. SQL Developers come across this scenario quite often – having to insert records into a table where a record doesn’t already exist. The age-old technique and I suspect most common practice is doing a left join where the values are null from the table being inserted into.
You should first create a
UNIQUE INDEX on the code column. You can then safely insert the data without warnings using:
INSERT INTO LICENSE_TABLE(code, license_type, distributor) SELECT 'uniquecode', 'standard', 'walmart' FROM (SELECT 1) AS x WHERE NOT EXISTS ( SELECT 1 FROM LICENSE_TABLE WHERE code = 'uniquecode' )
MySQL INSERT IGNORE Statement Explained By Examples, How do you add a column only if it does not exist in table? insert into tbl01 (sale_store, sale_dt, sale_register, sale_trans) select distinct sale_store, sale_dt, sale_register, sale_trans from temp where NOT EXISTS (select * from tbl01) The issue that I'm having is that it runs, but does not put any new records into the table - there should be be lots of new records.
INSERT IGNORE like
INSERT IGNORE INTO LICENSE_TABLE (code, license_type, distributor) values ("uniquecode", "standard", "walmart")
But you need to have a unique index on the
code column. Check if you have one already either with
show indexes from LICENSE_TABLE; or
show create table LICENSE_TABLE;
If you don't have one, you can create one like this:
create unique index uidx_license_table_code on LICENSE_TABLE(code);
How to INSERT If Row Does Not Exist (UPSERT) in MySQL, clause is an extension of MySQL to the SQL standard. Suppose, you want to add a position into the positions table if it does not exist, in case the position exists, update the current one. The following REPLACE statement inserts a new row into the positions table because the position title Full Stack Developer is not in the positions table.
[Solved] Mysql: insert record if not exists already, Learn how to INSERT an If Row Does Not Exist (UPSERT) in MySQL. of INSERT statements for a combination of data that is both already existing in the value for the id field (which is a UNIQUE PRIMARY_KEY in the table), using a basic You can use Merge Statement which is there in oracle9iBut this is only in 10g that you can do not give the matche clause. SQL> create table tbl_mrg1 2 as 3 select 1 id, 'one' text from dual 4 union all 5 select 2, 'two' from dual; Table created.
How to Use The MySQL REPLACE Statement to Insert or Update, There is slight change in Query, Just try to select the record first which you want to insert in database, if it is not exist then you can insert in it. MySQL: Insert record if not exists in table - Stack Overflow[^] it will automatically check the unique column for duplicate an each row that is about to be inserted In a single-table insert, you insert values into one row of a table, view, or materialized view by specifying values explicitly or by retrieving the values through a subquery. You can use the flashback_query_clause in subquery to insert past data into table. Refer to the flashback_query_clause of SELECT for more information on this clause.
SQL: Fastest way to insert new records where one doesn't already , To determine whether the new row that already exists in the table, MySQL If the table does not have one of these indexes, the REPLACE works like an INSERT Unlike the UPDATE statement, if you don't specify the value for the column in SQLiteDatabase: Insert only if the value does not exist (not via raw SQL command) Since you don’t want to use raw queries you can achieve it that before inserting, just create some function that will test if value is already in database. It could return boolean(or int) and if it return false, you will perform insert query. A little example:
- You can ALTER your table so the
codecolumn has a UNIQUE index. That way you get an error in case of entry duplication.
- @dashboard I used your solution
- @user1283776 . . . This is not thread-safe. Two threads could attempt inserts of the same value at the same time, resulting in an error. A better answer is
INSERT IGNORE. The best answer is
ON DUPLICATE KEY UPDATE.
- @GordonLinoff why would it be non-thread safe? It is one query. Why would a sane database server interleave the execution?
- . . A second insert could be attempted at exactly the same time. They would both attempt the update, not see the data in the table (potentially) and one would generate an error due to the unique index.
- @gordon this should not happen in a sane rbms. The second update should wait until first update is finished, at which time it should see the inserted row.
- . . That depends on the locking mechanism. In general, full serialization is not the default for such operations, because that is quite expensive.