The return value of the IFNULL () function can be either string or a numeric value. It depends on the context. It’s good practice to avoid IFNULL() function in the WHERE clause as it will degrade the performance; instead, you can use ISNULL() or IS NOT NULL function. This session...
Explanation: We should be aware not to get confused with the MySQL NULLIF() function is the same as the IFNULL() function because both functions are slightly different. We use the SELECT statement and NULLIF() function while writing the query command in MySQL. How does MySQL NULLIF() Functi...
I have a query in which I want to insert the sum of all the quantities belonging to old and new types. Following is the table in which I want to insert: CREATE TABLE parts( `PART` varchar(25) NOT NULL default '', YEAR intT(4), ...
here is the sql: SELECT IFNULL(A.price, B.price) FROM table1 B INNER JOIN (SELECT price, product_id FROM table2 WHERE user_id=xxx) A ON A.product_id=B.product_id how can I get the same results with sequelize I use mysql
Instead of having that null, you might want that row to be 0. To do that, use the ifnull function, which returns the first non-null argument it's passed: select day, ifnull(tickets, 0) from stats; day | tickets ---+--- 2018-01-01 | 1 2018-01-02 | 0 2018-01-03 | 3 Pr...
To reclaim the disk space, you can execute a NOOP (no-operations) alter or null alter on the table, which re-arranges the data and indexes and frees storage space for use. Next, I’ll run the following command: mysql> alter table space_reclaim.sbtest1 eng...
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Execute Multiple Joins in One Query in MYSQL - Three-Table Join With the ON KeywordThere is another possibility to meet our goal. We can use the ON keyword as in:SELECT client_name, SUM(product_order.quantity * (product.unit_price - product.supplier_cost)) AS profit FROM product_order ...
Staged Rollout: If you are in control of your application, you may be able to implement a feature to change thesql_modeon a per user-basis. A good use case for this would be to allow internal users to beta test everything to allow for a more gradual transition. ...
I made quite a complex View on my MySQL database, and I realized that some queries are slow. My first idea was to add indexes but it's not possible to do on a view so I'm lost on how to improve the performance of my query. ...