PostgreSQL missing a data type for time zone and doesn't contain any function for time zone verification. You are discouraged from using these types in applications these internal types might disappear in a future release."ĭavid E. Note: You can use casting to abstime type, but: "The types abstime and reltime are lower precision types which are used internally. Postgres=# SELECT array_to_string(ARRAY, ',','') Ĭast between "unix timestamp" and timestampĬREATE OR REPLACE FUNCTION convert_timestamp_to_xtime(dt timestamp)ĬREATE OR REPLACE FUNCTION convert_xtime_to_timestamp(xdt integer) This issue is fixed in modern versions, that allow third parameter for NULL substitution. Postgres=# select to_string(array,',','') ĬREATE OR REPLACE FUNCTION to_array(text, sep text, nullstr text DEFAULT '')įROM unnest(string_to_array($1,$2)) g(v)) SELECT array_to_string(ARRAY(SELECT coalesce(v::text, $3) So I designed new functions with better NULL handling.ĬREATE OR REPLACE FUNCTION to_string(anyarray, sep text, nullstr text DEFAULT '') Functions string_to_array and array_to_string doesn't handle NULL value well. 25 Expect SQL functions to be really fastĪuthor: Pavel Stěhule.24 Solution for migration to 8.3 (problem with tsearch2). 23 SQL code for hierarchical break-down of domains.21 Get default values from table definition.20 Encoding number to any numeral system with CTE.19 Moving tables from one schema to second schema.16 Protection from parallel run of some PL function.15 Faster execution of PL/pgSQL function with explicit casting.14 Attention on IS NULL and IS NOT NULL operators for composite types.13 Dropping milliseconds from timestamp.11 Marking files as orig (for difforig command) based on patch.9 The first from groups (with windows functions).7 MySQL function group_concat in PostgreSQL.4 Non-interactive entering a password for psql.2 Cast between "unix timestamp" and timestamp.
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