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From:Gerald Clark Date:June 13 2002 7:54pm
Subject:Re: Why does Key==Mul in DESCRIBE TABLE for unique key?
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CREATE TABLE X (FLD1 INT PRIMARY KEY);
or
CREATE TABLE X (FLD1 INT, UNIQUE(FLD1));

UNIQUE applies to an index, not a field.



Andy Sy wrote:

>----- Original Message ----- 
>From: "Paul DuBois" <paul@stripped>
>To: "Andy Sy" <andy@stripped>; <mysql@stripped>
>Sent: Friday, June 14, 2002 2:45 AM
>Subject: Re: Why does Key==Mul in DESCRIBE TABLE for unique key?
>
>
>>At 2:03 +0800 6/14/02, Andy Sy wrote:
>>
>>>mysql> CREATE TABLE X (FLD1 INT UNIQUE);
>>>Query OK, 0 rows affected (0.05 sec)
>>>
>>>mysql> DESCRIBE X;
>>>+-------+---------+------+-----+---------+-------+
>>>| Field | Type    | Null | Key | Default | Extra |
>>>+-------+---------+------+-----+---------+-------+
>>>| FLD1  | int(11) | YES  | MUL | NULL    |       |
>>>+-------+---------+------+-----+---------+-------+
>>>
>>>Doesn't MUL mean a key can exist multiple times
>>>in the index?
>>>
>>Right. It means it's part of a non-unique index.
>>
>
>But I declared the field as UNIQUE (see the CREATE
>TABLE statement).
>
>
>
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  • Why does Key==Mul in DESCRIBE TABLE for unique key?Andy Sy13 Jun
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  • Re: Why does Key==Mul in DESCRIBE TABLE for unique key?Andy Sy13 Jun
    • Re: Why does Key==Mul in DESCRIBE TABLE for unique key?Paul DuBois13 Jun
  • Re: Why does Key==Mul in DESCRIBE TABLE for unique key?Gerald Clark13 Jun
    • Re: Why does Key==Mul in DESCRIBE TABLE for unique key?Paul DuBois13 Jun