For example, I lock some rows: c2 is not indexed. It means MySQL has to search entire table and if it read uncommitted or read committed isolation levels it places locks on every scanned row and if it doesn’t satisfy the WHERE condition it immediately release the lock. If it is repeatable read those loc…
Oracle SQL: How to fetch only style tag attributes from column?
I want to fetch only style tag attributes from a column i.e., style tag between double quotes (“). Style= can be anywhere in the column. Below is the sample data: Expected: Output: Tried below code: With this I am getting double quotes also in the output. Need help on how to get only style tags without …
Express-Postgres fails to apply array filter: error: operator does not exist: integer[] && text[]
The same query works on the terminal. But for some reason I’m getting an error: pg.query is unable to process the expression path && Array[$1] using this: https://www.postgresql.org/docs/9.2/functions-array.html Answer This should work: Why? Short answer: type resolution. Long answer: Concluding…
How to select and view database with specific value?
So I’m trying to search and print the value from the PHPMyAdmin database. But the result shows all row which has variable with containing the value. Like when I try search variable int bulan that has value 2. This also shows a row that has a value of 12, 22 or 23 as a result. this is my code Answer
DROP Constraint without knowing the name
I know there are a lot of references out there for what I am going to mention. I am rather sharing something I feel should be very useful and consolidating in one place – Q&A-style. I have struggled earlier finding this for different constraints on different time. The following constraints are commo…
ORA-01722: invalid number regexp [closed]
I have the below bit of code: WITH aux ( str ) AS ( SELECT ‘A b s d’ FROM dual ) SELECT regexp_substr(str, ‘a’, ‘n’) reg FROM aux; However, I’m getting …
How to use ilike and wildcard pattern in python psycopg2?
I already referred this post and this post but it doesn’t help I am trying to write the below code import psycopg2 param_dic = { “host” : “localhost”, “database&…
group and join two tables based on id?
I have a mysql table that looks something like this: id | name ———– 1 | cola 2 | pepsi 3 | sprite and other table: costumer | buy1 | buy2 ———————- Jhon | 2 | 3 Alice …
Can I have SQL incrementally count XML elements while parsing?
So this is my first foray into parsing XML, and I’m trying to figure out how to get this to work how I want. Given the following XML format: I want it to put it in a SQL table as the following: Basically, imagine a grid, and each “TileRow” starts a new Row in that grid. Each “TileValue…
Variable to replace %s for sql is not getting honored
I have a table with single empty row inserted. Later I want to update column with some value into the row. I am trying to compose a function which will work for all the columns as shown upon execution update_column(‘fieldName’, 10), getting following error. Any help is appreciated. Failed to execu…