I am trying to write a DB2 query that allows me to either update a record if it already exists but if it does not exist it should be inserted. I wrote the following query that should accomplish this: This query should attempt to check if a record already exists for the selection criteria. Updating a record se…
Unnecessary blank row in SQL query
Aim was to write a SQL query to return ride details from a public database. While going through a data analytics course, I stumbled across this problem. the code used is correct as the instruction provided was the same however the result I obtained was different. The first row returned a blank row with just t…
SQL select of records from table A but not in table B
Please, can someone help me find the SQL statement that select all records in TABLE_A except those whose combination of FIELD_1, FIELD_2 is not present in TABLE_B. (In DB2) Answer You can simply use NOT EXISTS:
Querying JSON in POSTGRESQL returns NONE everytime
jsonb column text_results contains values in the following form : {‘Name’ : ‘john doe’ , ‘id’ : ‘123’} On querying Select text_results->>’Name’ as Name from user_master or Select json_extract_path_text(text_results::json,’Name’) as …
MYSQL – Cannot update a parent row: a foreign key constraint fails
db-fiddle link SCHEMA QUERY UPDATE QUERY ERROR If I change the ID of FIELD_TEST, To change the GRAPH_FIELD_INFO_TEST ID referring to the ID of FIELD_TEST, I set it as cascade in GRAPH_FIELD_INFO_TEST. However, it fails due to the following error. If I change the ID of GRAPH, it works normally, but it doesn…
Error with passing in the same variable into multiple parts of SQL statement
So I have a Node.js query that should pass in these three values and update a specific column by a specific amount for a user with a specific id: The ‘sqlStatement’ looks like: As you can see, it should pass in the values such that the SQL statement looks like: I’ve also tried to write sqlSt…
How is this cardinality being calculated in Explain plan?
I am analyzing the “explanation plan” about the following instruction and Oracle SQL Developer tells me that it has a cardinality of 1513 and cost of 1302. How are these calculations performed? Could be reproduced with an instruction (calculate with a select and obtain de same value)? Answer The c…
DB2 SELECT from UPDATE Options
I am currently trying to do an However, the version of DB2 I have does not appear to support this Is there any alternative to this in DB2 that could be return a desired result? Where in one query we can Update and Return the result? EDIT – The Select statement is supposed to return the values that are t…
vb Directly putting sql data from database into textbox once login is sucessful
I need some help with putting the SQL data from my database directly into Textbox1 (Firstname) and Textbox2 (lastname) once the login is successful. Basically, my code validates the username, password, and email (using the stored password, username, and email from my sql table). Then, its supposed to put the …
SQL Statement with the same multiple subqueries running very slow
I am hoping someone here can help me. I have been given this query that takes a long time to run (over 30 min). I have been trying to rewrite the query but with no luck thus far. I am posting an example of the query so that you can get an idea of what it is I am trying