8/3/2023 0 Comments Sql dummy data generator![]() ![]() Mentioned PL/SQL was my mistake, I thought PL/ stands for procedural features in SQL in general, not just Oracle. I know SQL a bit, but I'm not good in PL/SQL, loops in SQL etc. data.channel is always 1, no need to care about that too.data.id is autoincrement, no need to care about that.data.value field: random float numbers from given range (0.00-100.00 for example).data.datetime field: random timestamps but only from one year.How can I fill it with 1000000 million rows in MySQL? `datetime` timestamp NULL DEFAULT CURRENT_TIMESTAMP, My table looks like this: CREATE TABLE `data` I want to run some queries with grouping, calculating averages and other performance experiments. Application features a fully functional free trial so you can download and try it to see if it works for you.I want to try how much storage space I need for 1000000 (1M) rows and how Raspberry Pi deals with such big table. The tool has an integrated function to generate large amounts of randomized data from the imported. The tutorial also explains how to use a 3rd party SQL data generator called ApexSQL Generate. The drawback to this method is that it will insert large blocks of rows with the same data, without randomizing them. csv file contains few hundred rows of data it is just not enough. If there is a need for thousands of rows to be populated, and the. csv file using SSMS or custom SQL import scripts, is easier than creating SQL inserts manually, but there are some limitations, as explained in the tutorial: There is a step-by-step tutorial on how to do this, so you might want to check it out: īe aware that importing a. The tblBooks table contains four columns: Id, Authorid, Price and Edition. Take a look at the following script: The tblAuthors table contains three columns: Id, Authorname and Country. csv file using SSMS or custom SQL import scripts, programs. First we need to create the example library database and add the tables to it. Late answer but can be useful to other readers of this thread.īeside other solutions, I can recommend importing data from a. I've generated absolutely delightful (and quite authentic-looking) datasets from it. I populated my tables with over 10,000,000 records which was an awesome simulation. The best tool (if you can find it) is DataFactory. Even you can use regular expression to restrict selected characters. You have a bunch of options which allow you to decide how every column is supposed to be populated, every column is anticipated semantically so that related data are suggested, for instance if you have a column named 'Department' it isn't filled by weird characters, it's filled by expressions like "Technical", "Web", "Customer", etc. The good point is that RedGate identifies foreign keys so you can apply JOIN in your queries. After a while you have a table with dummy rows in it!Īs mentioned, RedGate Data Generator is a so good tool to fulfill it, it costs $369, you have a 14 days trial chance Although.Run the following query, it's going to be run 1000 times, you can change it to more or less but be aware that it might last minuets based on your computer hardware:.Note:Keep in mind that if it has a Identity filed, change it's Identity Specification to No Since you are supposed to fill the new table by the data of the original one repeatedly. Name your new table to something else like dbo.CustomersTest, Now you can execute the query to have a new table with similar structure with the dbo.Customers. Right click on it and select Script Table as > Create To > New Query Editor Window If you want to have a table which is filled a little bit more elaborated then you can achieve that the same way this time by executing a simple query and following these steps:Ĭhoose one of your tables which has a remarkable number of rows, say dbo.Customers This is sort of an arithmetic progression, so it's going to last a little, don't use a big number in front of GO. SELECT Id, FirstName, Last Name FROM dbo.CustomersĪn explicit value for the identity column in table 'dbo.Customers' can only be specified when a column list is used and IDENTITY_INSERT is ON. SELECT FirstName, Last Name FROM dbo.Customers In the case one or more column are identity (meaning they accept unique values, if it's auto incremental), you just don't place it in your query, for instance if Id in dbo.Customer is identity, the query goes like this: INSERT INTO dbo.Customers It will make a table with 1000 same rows in it.Īnother solution is that you can populate the beginning rows of your table with some data, then you fill the next rows of table by repeating the beginning rows over and over, it means you fill your table by itself: INSERT INTO dbo.Customers You Only need Go 1000 after your INSERT, to fill it 1000 times, just like this: INSERT INTO dbo.Cusomers(Id, FirstName, LastName) VALUES(1, 'Mohamed', 'Mousavi')
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