To use this feature you have to enable it for your connection: var connection = mysql.createConnection({multipleStatements: true}); Notice that in Query3, the union query, when the ordering is about to be appended, first the semicolons are removed, then the table name from the field names. Hello, I have one table and like to combine multiple select statements in one query. I wonder if there is a way to make all counts in one query. 1 A 2 B 3 A 4 C 5 B 6 D 7 E If multiple queries mean multiple round trips to the database server, you also collect multiple times the network latency and transaction overhead, possibly even connection overhead. The MySQL AND condition and OR condition can be combined in a SELECT, INSERT, UPDATE, or DELETE statement. For each count, mysql needs to walk thoughout the table, and this is a big problem if having long table and numerous queries. Insert all the values in a table with a single MySQL query separating records by comma ID Dept. This is why using multiple queries isn't a good idea. (Just like when you were learning the … The CREATE TABLE statement is: Run multiple existence checks in one query, which will work fine if the answers are mostly TRUE and might be rather slow if the answers are mostly FALSE; Run multiple counts in one query (as suggested in this article) which will run the same speed regardless of the individual results as it’ll do a single full table scan ... my first thought is to try to help get that code to only use one query. But using JOINs, you can get the work done by using only a one query with any search parameters. Mysql multiple queries from one PHP file. When combining these conditions, it is important to use parentheses so that the database knows what order to evaluate each condition. I guess you are using node-mysql. In this case, when mysql walks over each row, it will process all counts, and … Copy values of one column to another using INSERT and SELECT in a single MySQL query How to alter column type of multiple columns in a single MySQL query? Multiple statement queries. Big, big loss. The docs says: Support for multiple statements is disabled for security reasons (it allows for SQL injection attacks if values are not properly escaped). Display the sum of positive and negative values from a column in separate columns with MySQL; MySQL Select Statement DISTINCT for Multiple Columns? Ask Question Asked 2 years, 11 months ago. There are three conditions that the query needs to check against and all three of these make up the composite primary key. How to join three tables in SQL query – MySQL , If you need data from multiple tables in one SELECT query you need to use either subquery or JOIN. Depending on your setup, network latency alone may take longer than all the rest by orders of magnitude. 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