Solved: How do I fix ORA-01502: Index or partition of such index is in unusable state error

Problem Symptom I get the below error when inserting data in the table with 1 primary key and 3 foreign keys, 1st row below is the Primary key index and I do not know the Partition. Why is this happening & How to fix this issue? The detailed error message is as below: ORA-01502: Index …

Solved: What does the SQL/MySQL Aliases syntax do and mean?

Question: Refer to the below SQL statement for syntax highlighted in bold. SELECT t1.* FROM provider_payments t1 WHERE t1.id = (SELECT MAX(t2.id)FROM provider_payments t2 WHERE t2.account_id = t1.account_id) Normally after the FROM clause, we would see “tablename1, tablename2”, but here we can not see a comma behind the table name. Read on below explanation to …