$ sqlite3
SQLite version 3.7.17 2013-05-20 00:56:22
Enter ".help" for instructions
Enter SQL statements terminated with a ";"
sqlite> CREATE TABLE x AS SELECT 1 AS a, 1 AS b;
sqlite> CREATE INDEX ix ON x (a);
sqlite> CREATE TABLE y AS SELECT 1 AS b;
sqlite> EXPLAIN QUERY PLAN SELECT * FROM x INNER JOIN y ON x.b=y.b;
0|0|0|SCAN TABLE x (~1000000 rows)
0|1|1|SEARCH TABLE y USING AUTOMATIC COVERING INDEX (b=?) (~7 rows)
sqlite> EXPLAIN QUERY PLAN SELECT * FROM x INNER JOIN y ON x.b=y.b WHERE
x.a = 1;
0|0|0|SEARCH TABLE x USING INDEX ix (a=?) (~10 rows)
0|1|1|SEARCH TABLE y USING AUTOMATIC COVERING INDEX (b=?) (~7 rows)
sqlite>

$ sqlite3
SQLite version 3.8.4.3 2014-04-03 16:53:12
Enter ".help" for usage hints.
Connected to a transient in-memory database.
Use ".open FILENAME" to reopen on a persistent database.
sqlite> CREATE TABLE x AS SELECT 1 AS a, 1 AS b;
sqlite> CREATE INDEX ix ON x (a);
sqlite> CREATE TABLE y AS SELECT 1 AS b;
sqlite> EXPLAIN QUERY PLAN SELECT * FROM x INNER JOIN y ON x.b=y.b;
0|0|0|SCAN TABLE x
0|1|1|SEARCH TABLE y USING AUTOMATIC COVERING INDEX (b=?)
sqlite> EXPLAIN QUERY PLAN SELECT * FROM x INNER JOIN y ON x.b=y.b WHERE
x.a = 1;
0|0|0|SEARCH TABLE x USING INDEX ix (a=?)
0|1|1|SCAN TABLE y
sqlite>

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