Firman Wandayandi wrote:
Hi,
Is any possible way to know if a column is UNIQUE without "PRAGMA
index_info('<index_name>')"? Seems "PRAGMA table_info('<table_name>')"
doesn't returns the unique flag of column.
Thanks for advice.
Firman,
You should try pragma index_list('<table_name>'). It returns a list of
all the indexes (or indices) on the specified table. It provides a flag
for each unique index as well as the index names. You can then get the
details about the number, and order of the columns in the index using
pragma index_info.
Here is a short sample session with the sqlite shell.
SQLite version 3.3.8
Enter ".help" for instructions
sqlite> create table t (a integer primary key, b text unique);
sqlite> .header on
sqlite> .mode column
sqlite> pragma table_info('t');
cid name type notnull dflt_value pk
---------- ---------- ---------- ---------- ---------- ----------
0 a integer 0 1
1 b text 0 0
sqlite> pragma index_list('t');
seq name unique
---------- -------------------- ----------
0 sqlite_autoindex_t_1 1
sqlite> pragma index_info('sqlite_autoindex_t_1');
seqno cid name
---------- ---------- ----------
0 1 b
HTH
Dennis Cote
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