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The table has four rows, whereas the index only has three The first three rows, where at least one of the index key elements was not Null, are in the index The last row with (NULL, NULL) is not in the index One of the areas of confusion is when the index is a unique index, as just shown Consider the effect of the following three INSERT statements: ops$tkyte@ORA11GR2> insert into t values ( NULL, NULL ); 1 row created ops$tkyte@ORA11GR2> insert into t values ( NULL, 1 ); insert into t values ( NULL, 1 ) * ERROR at line 1: ORA-00001: unique constraint (OPS$TKYTET_IDX) violated ops$tkyte@ORA11GR2> insert into t values ( 1, NULL ); insert into t values ( 1, NULL ) * ERROR at line 1: ORA-00001: unique constraint (OPS$TKYTE.

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T_IDX) violated The new (NULL, NULL) row is not considered to be the same as the old row with (NULL, NULL): ops$tkyte@ORA11GR2> select x, y, count(*) 2 from t 3 group by x,y 4 having count(*) > 1; X Y COUNT(*) ---------- ---------- ---------2 This seems impossible; our unique key isn t unique if we consider all Null entries The fact is that, in Oracle, (NULL, NULL) is not the same as (NULL, NULL) when considering uniqueness the SQL standard mandates this (NULL,NULL) and (NULL,NULL) are considered the same with regard to aggregation, however The two are unique for comparisons but are the same as far as the GROUP BY clause is concerned That is something to consider: each unique constraint should have at least one NOT NULL column to be truly unique.

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Test read/write access */ printf("program : Inserting record\n"); sqlite3_exec(db, "insert into foo values (1,2,3)", NULL, NULL, &zErr); printf("program : Selecting record (value for z should be NULL)\n"); print_sql_result(db, "select * from foo"); printf("program : Updating record (update of x should be denied)\n"); sqlite3_exec(db, "update foo set x=4, y=5, z=6", NULL, NULL, &zErr); printf("program : Selecting record (notice x was not updated)\n"); print_sql_result (db, "select * from foo"); printf("program : Deleting record\n"); sqlite3_exec(db, "delete from foo", NULL, NULL, &zErr); printf("program : Dropping table\n"); sqlite3_exec(db, "drop table foo", NULL, NULL, &zErr); Several things are going on here The program selects all records in the table, one of which is column z We should see in the output that column z s value is NULL All other fields should contain data from the table Next, the program attempts to update all fields, the most important of which is column x.

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The question that comes up with regard to indexes and Null values is, Why isn t my query using the index The query in question is something like the following: select * from T where x is null; This query cannot use the index we just created the row (NULL, NULL) simply is not in the index, hence the use of the index would return the wrong answer Only if at least one of the columns is defined as NOT NULL can the query use an index For example, the following shows Oracle will use an index for an X IS NULL predicate if there is an index with X on the leading edge and at least one other column in the index is NOT NULL: ops$tkyte@ORA11GR2> create table t ( x int, y int NOT NULL ); Table created ops$tkyte@ORA11GR2> create unique index t_idx on t(x,y); Index created..

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