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POHow to determine which UNIQUE index enforces the PRIMARY KEY in Oracle
 

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  1. POHow to determine which UNIQUE index enforces the PRIMARY KEY in Oracle
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    <p>Given a table with two unique indexes, as shown below, how does one determine which unique index corresponds to the PRIMARY KEY, as opposed to other UNIQUE indexes on that table?</p> <p>The user_indexes and user_ind_columns do not seem to carry that information. Thanks, --DD</p> <p>PS: Short of explicitly naming the indexes and using a naming convention of course.</p> <pre><code>SQL&gt; create table tt (id number not null primary key, name varchar2(64 char) not null unique, info varchar2(4000)); SQL&gt; create index tt_idx on tt(info); SQL&gt; select INDEX_NAME, INDEX_TYPE, UNIQUENESS from user_indexes where TABLE_NAME='TT'; INDEX_NAME INDEX_TYPE UNIQUENES -------------------- --------------------------- --------- SYS_C0029541 NORMAL UNIQUE SYS_C0029542 NORMAL UNIQUE TT_IDX NORMAL NONUNIQUE SQL&gt; select * from user_ind_columns where TABLE_NAME='TT'; INDEX_NAME TABLE_NAME COLUMN_NAME COLUMN_POSITION COLUMN_LENGTH CHAR_LENGTH DESC -------------------- -------------------- ------------ --------------- ------------- ----------- ---- SYS_C0029541 TT ID 1 22 0 ASC SYS_C0029542 TT NAME 1 256 64 ASC TT_IDX TT INFO 1 4000 4000 ASC </code></pre> <p><strong>Update:</strong></p> <p>Here's the result of running Florin's query, which clearly shows which index enforces the <strong>P</strong> RIMARY KEY:</p> <pre><code>SQL&gt; select constraint_name, constraint_type, index_name from user_constraints where table_name='TT'; CONSTRAINT_NAME C INDEX_NAME ------------------------------ - -------------------- SYS_C0029539 C SYS_C0029540 C SYS_C0029541 P SYS_C0029541 SYS_C0029542 U SYS_C0029542 </code></pre>
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