I have a MySQL database separate_data, which consists of 200 tables with random names (for example first_table, second_table, …) Each of these tables have the same structure and indexes. The total size is about 30GB. I would like to copy all this data to a new MySQL database called new_database, in the table all_data, keeping the structure (but dropping the
Tag: union
SQL: Joining tables and dividing each cell by match cell in another table?
Here is my population dataset detailing the population of each state through 2010 – 2019: Here is my consumer complaints dataset which has date received and state: I already have the complaints for each state per year: I know I need to join compltsbypear and uspop on state and divide 2011(from complaints) / 2011 from uspop, etc for each match
logic to create more rows in sql
I have a table1 that I wanted to transform into the expected table. Expected table logic for columns: cal: comes from cal of table1. ID comes from the ID of table1. code: this is populated with lp or fp depending upon if we have a value in f_a then we create a new record with fp as code. corresponding to
Apply multiple validation to SQL records and identify all failing validations
I have a requirement where I need to capture all failing validations in SQL database. I have below table: My validation rules are as follows: Department should be IT Age should be in 20s Age should not be 25 These are sample validation and my requirement is to capture all failed records along with failing conditions, I have achieved it
Cumulative balance across two tables
I want to get data from 2 tables ordering them by date: to get the cumulative balance for the customer The 2 tables that I want to get data from are my tables: transfers & trans_payments transfers:…
Oracle combines two records in one record despite of Union
I have created two simple queries to combine the records using UNION However, I faced a problem in one case, the data in the 1st table is exactly like the 2nd one Then the result appears in one record,…
mysql – fetch related rows from multiple tables without all combinations
Let’s say I have a primary table record, and it has 2 related tables fields and comments. I would like to run one query that fetches a set of records AND fetches all the related fields for that record, AND fetches all the comments related to that record. If I do left joins to ensure I get the records, I
Psql query : Union is not preserving the order of rows coming from cte
I have this query: cte1 is ordered by salary column but cte2 is not. I want the results of cte2 to get appended to the results of cte1 while preserving the order of results from cte1. But it’s not happening. If I run the above query without union with the second cte, the results are displayed in the expected order
How to Sort this MySQL Query
I am trying to insert the ORDER BY in this query to sort the Total column: With the following result: Here’s what I have tried so far but no luck: Answer I think you want: Rationale: the ORDER BY clause should go after all UNION ALL subqueries – so it needs to be outside of the GROUP_CONCAT(), in an outer
What is the proper term for one of the disjuncts in a query using UNION?
Complete the sentence: In the query the sub-selects SELECT 0 and SELECT 1 are properly known as the ___________s of the UNION. I am not looking for your opinion on what would be a good name – I want you to back your answer up with a reference to some kind of authoritative source. Answer If I understand the Standard