mysql - How to merge SQL SELECT fields -

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I had a MySQL table with an ENUM. Since I had to change this ENUM occasionally, so I moved it to another table. Now I have to make a statement, which will give me the name of enum / newTable in a selection area.

Table 1 (Bottle): 

  id | Size | Size_id1 Small | (NULL 2) Medium | (NULL) 3 | Big | (NULL) 4 | (NULL) | 1 5 | (NULL) | 2 6 | (NULL) | 3   
 Table 2 (bottle_size):  
  id | Name 1 Small 2 Medium 3 Select larger   
:  
  SELECT id, & lt; Dontknow & gt; As the size of the size of the bottle, the left hold bottle size is b.size_id = bz.id where size = 'small';   
 
> 
 If you do not have the  NULL  or the second field, then you can use the first field to select. Because it returns results in a dynamic area ("size"), you must use  WHERE  instead of  HAVING  to add a condition:  
  SELECT b.id, IFNULL (b.size, bz.name) Size as bottle B shape size Bottle size bz.sid_id = bz.id HAVING size = 'small';   
 Demo:

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