Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_23537091_1 ( early_chalcolithic VARCHAR, ubaid_period_in_mesopotamia VARCHAR )

### Question ###
When the second intermediate period of egypt is the ubaid period in mesopotamia how many early calcolithics are there?

### Accurate SQL ###

SELECT COUNT(early_chalcolithic) FROM table_23537091_1 WHERE ubaid_period_in_mesopotamia = "Second Intermediate Period of Egypt"