SQL

mysql take number in string

select REGEXP_SUBSTR(name,"[0-9]+") as amount from `subscriptions`;

mysql extract number from string

SELECT CAST(SUBSTRING(myStringWNumber, posNumStart, posNumEnd), <NUM_TYPE>) FROM table;

<NUM_TYPE>
SIGNED	  Converts value to SIGNED (a signed 64-bit integer)
UNSIGNED  Converts value to UNSIGNED (an unsigned 64-bit integer)
BINARY	  Converts value to BINARY (a binary string)
DECIMAL	  Converts value to DECIMAL. Use the optional M and D parameters 
          to specify the maximum number of digits (M) and the number of digits 
          following the decimal point (D).