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-.pgaw:Help.f.t insert end "CREATE AGGREGATE" {bold} " allows a user or programmer to extend Postgres functionality by defining new aggregate functions. Some aggregate functions for base types such as \
-min\(int4\) and avg(float8) are already provided in the base distribution. If one defines new types or needs an aggregate function not already provided then CREATE AGGREGATE can be used to provide \
-the desired features. 
-
-An aggregate function can require up to three functions, two state transition functions, sfunc1 and sfunc2: 
-    sfunc1( internal-state1, next-data_item ) ---> next-internal-state1
-    sfunc2( internal-state2 ) ---> next-internal-state2   
-
-and a final calculation function, ffunc: 
-
-    ffunc(internal-state1, internal-state2) ---> aggregate-value   
-
-Postgres creates up to two temporary variables (referred to here as temp1 and temp2) to hold intermediate results used as arguments to the transition functions. 
-
-These transition functions are required to have the following properties: 
-
-       The arguments to sfunc1 must be temp1 of type sfunc1_return_type and column_value of type data_type. The return value must be of type sfunc1_return_type and will be used as
-       the first argument in the next call to sfunc1. 
-
-       The argument and return value of sfunc2 must be temp2 of type sfunc2_return_type. 
-
-       The arguments to the final-calculation-function must be temp1 and temp2 and its return value must be a Postgres base type (not necessarily data_type which had been specified for
-       BASETYPE). 
-
-       FINALFUNC should be specified if and only if both state-transition functions are specified. 
-
-An aggregate function may also require one or two initial conditions, one for each transition function. These are specified and stored in the database as fields of type text. 
-
-" {} "Synopsis" {bold} "
-" {} "
-CREATE AGGREGATE name \[ AS \]
-    ( BASETYPE    = data_type
-    \[ , SFUNC1    = sfunc1
-      , STYPE1    = sfunc1_return_type \]
-    \[ , SFUNC2    = sfunc2
-      , STYPE2    = sfunc2_return_type \]
-    \[ , FINALFUNC = ffunc \]
-    \[ , INITCOND1 = initial_condition1 \]
-    \[ , INITCOND2 = initial_condition2 \]
-    )
-
-" {code} "Inputs" {bold} "
-
-" {} "name" {italic} "
-       The name of an aggregate function to create. 
-
-" {} "data_type" {italic} "
-       The fundamental data type on which this aggregate function operates. 
-
-" {} "sfunc1" {italic} "
-       The state transition function to be called for every non-NULL field from the source column. It takes a variable of type sfunc1_return_type as the first argument and that field as the
-       second argument. 
-
-" {} "sfunc1_return_type" {italic} "
-       The return type of the first transition function. 
-
-" {} "sfunc2" {italic} "
-       The state transition function to be called for every non-NULL field from the source column. It takes a variable of type sfunc2_return_type as the only argument and returns a variable
-       of the same type. 
-
-" {} "sfunc2_return_type" {italic} "
-       The return type of the second transition function. 
-
-" {} "ffunc" {italic} "
-       The final function called after traversing all input fields. This function must take two arguments of types sfunc1_return_type and sfunc2_return_type. 
-
-" {} "initial_condition1" {italic} "
-       The initial value for the first transition function argument. 
-
-" {} "initial_condition2" {italic} "
-       The initial value for the second transition function argument. 
-
-" {} "Outputs" {bold} "
-
-" {} "CREATE" {italic} "
-
-       Message returned if the command completes successfully.
-
-" {} "Usage" {bold} "
-
-Refer to the chapter on aggregate functions in the PostgreSQL Programmer's Guide on aggregate functions for complete examples of usage. 
-
-" {} "Notes" {bold} "
-
-Use " {} "DROP AGGREGATE" {bold} " to drop aggregate functions. 
-
-It is possible to specify aggregate functions that have varying combinations of state and final functions. For example, the count aggregate requires SFUNC2 (an incrementing function) but not \
-SFUNC1 or FINALFUNC, whereas the sum aggregate requires SFUNC1 (an addition function) but not SFUNC2 or FINALFUNC and the avg aggregate requires both of the above state \
-functions as well as a FINALFUNC (a division function) to produce its answer. In any case, at least one state function must be defined, and any SFUNC2 must have a corresponding \
-INITCOND2."