storage/retrieval of ASCII(32)
problems storing/retrieving (ascii 32) value, it can be stored, but cannot be retrieved correctly.
for example :we have table x in which there is a column col( char(1) type) , when we are inserting chr(32) in col , t is inserting successfully but the time of retrieving it is giving output 0.
select ASCII(col) from x;
output is 0 instated of 32.
Answer Answered by Kristian Nielsen in this comment.
It is because char(n) columns strip trailing spaces when selected. So chr(32), a single space, gets interpreted as the empty string. See here:
https://mariadb.com/kb/en/char/
" Trailing spaces are removed when CHAR values are retrieved"
You can set the SQL_MODE to include PAD_CHAR_TO_FULL_LENGTH to disable this behaviour and be able to select the chr(32):
MariaDB> set sql_mode = concat(@@sql_mode, ',PAD_CHAR_TO_FULL_LENGTH');
MariaDB> create table t5 (a char(1));
MariaDB> insert into t5 values ('a'), (' ');
MariaDB> select a, length(a), ascii(a) from t5;
+------+-----------+----------+
| a | length(a) | ascii(a) |
+------+-----------+----------+
| a | 1 | 97 |
| | 1 | 32 |
+------+-----------+----------+
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