Oracle SQL find missing sequence in varchar2 field - sql

Question

I am new to oracle and to this forum. I have searched and found answers on how to do this with a column of just numbers but this has txt at the beginning then a sequenced number.
I have a table that has a varchar2 column named myid which has characters with a number at the end which is in order the number at the end is always 6 digits with leading zeros.
Hello_002190
Hello_002188
Bye_000187
Bye_000185
Bye_000184
Get_008133
Get_008131
Gone_001112
Gone_001110
Gone_001109
I need an Oracle SQL script that will show me all the missing rows.
The result for the above should be:
Hello_002189
Bye_000186
Get_008132
Gone_001111
Thanks in advance for the help

Answer 1

SQL Fiddle
Oracle 11g R2 Schema Setup:
CREATE TABLE table_name ( value ) AS
SELECT 'Hello_002190' FROM DUAL UNION ALL
SELECT 'Hello_002188' FROM DUAL UNION ALL
SELECT 'Bye_000187' FROM DUAL UNION ALL
SELECT 'Bye_000185' FROM DUAL UNION ALL
SELECT 'Bye_000184' FROM DUAL UNION ALL
SELECT 'Get_008133' FROM DUAL UNION ALL
SELECT 'Get_008131' FROM DUAL UNION ALL
SELECT 'Gone_001112' FROM DUAL UNION ALL
SELECT 'Gone_001110' FROM DUAL UNION ALL
SELECT 'Gone_001109' FROM DUAL;
Query 1:
WITH data ( prefix, suffix ) AS (
SELECT SUBSTR( value, 1, INSTR( value, '_' ) ),
TO_NUMBER( SUBSTR( value, INSTR( value, '_' ) + 1 ) )
FROM table_name
),
bounds ( prefix, min_suffix, max_suffix ) AS (
SELECT prefix, MIN( suffix ), MAX( suffix )
FROM data
GROUP BY prefix
)
SELECT prefix || TO_CHAR( column_value, 'FM000000' ) AS missing_value
FROM bounds b
CROSS JOIN
TABLE(
CAST(
MULTISET(
SELECT b.min_suffix + LEVEL - 1
FROM DUAL
CONNECT BY b.min_suffix + LEVEL - 1 <= b.max_suffix
) AS SYS.ODCINUMBERLIST
)
)
MINUS
SELECT value FROM table_name
Results:
| MISSING_VALUE |
|---------------|
| Bye_000186 |
| Get_008132 |
| Gone_001111 |
| Hello_002189 |