to_number(col,'xxxxxxxxxxxxxxxx') |
SELECT ('x' || lpad(hex, 16, '0'))::bit(64)::bigint |
conv 16 znakow hex na number |
len(col_str) |
lenght(col_str) |
dlugosc stringu |
123 || 456 -> 123456 |
123 || 456 -> Error |
concatenation |
nvl(MY_FIELD,'N/A') |
''coalesce(MY_FIELD,'N/A')'' |
default value |
| '' is not equal to NULL |
'' is equal to NULL |
empty string |
| upper(description) like '%DISCUSS%' |
description ilike '%DISCUSS%' |
case-insensitive like query |
| substr(tag,20) |
substring(tag from 0 for 20) |
first 20 characters of the tag string |
| automonous transaction |
supported |
unsupported |