ORA-00904-invalid identifier errors are frequently caused by case-sensitivity issues. Normally, Oracle tables and columns are not case sensitive and cannot contain punctuation marks and spaces. But if you use double quotes to create a quoted identifier, that identifier must always be referenced with double quotes and with the correct case. For example: create table bad_design(“goodLuckSelectingThisColumn … Read more
The reason for this error is that SQL SELECT statements are logically * processed in the following order: FROM: selection of one table or many JOINed ones and all rows combinations that match the ON conditions. WHERE: conditions are evaluated and rows that do not match are removed. GROUP BY: rows are grouped (and every … Read more
You can definitely get Boolean value from a SELECT query, you just can’t use a Boolean data-type. You can represent a Boolean with 1/0. CASE WHEN (10 > 0) THEN 1 ELSE 0 END (It can be used in SELECT QUERY) SELECT CASE WHEN (10 > 0) THEN 1 ELSE 0 END AS MY_BOOLEAN_COLUMN FROM … Read more
This is not possible directly, because chronologically, WHERE happens before SELECT, which always is the last step in the execution chain. You can do a sub-select and filter on it: SELECT * FROM ( SELECT A.identifier , A.name , TO_NUMBER(DECODE( A.month_no , 1, 200803 , 2, 200804 , 3, 200805 , 4, 200806 , 5, … Read more
Your problem is those pernicious double quotes. SQL> CREATE TABLE “APC”.”PS_TBL_DEPARTMENT_DETAILS” 2 ( 3 “Company Code” VARCHAR2(255), 4 “Company Name” VARCHAR2(255), 5 “Sector_Code” VARCHAR2(255), 6 “Sector_Name” VARCHAR2(255), 7 “Business_Unit_Code” VARCHAR2(255), 8 “Business_Unit_Name” VARCHAR2(255), 9 “Department_Code” VARCHAR2(255), 10 “Department_Name” VARCHAR2(255), 11 “HR_ORG_ID” VARCHAR2(255), 12 “HR_ORG_Name” VARCHAR2(255), 13 “Cost_Center_Number” VARCHAR2(255), 14 ” ” VARCHAR2(255) 15 ) 16 … Read more