By Priya Pedamkar. We have used create sequence statement to create a new sequence in the PostgreSQL database; it will create a new sequence. If we specify schema name at the time of sequence creation, then the sequence will be created with specified schema; otherwise, it is created in the current schema. The temporary sequence is present in a special schema, so we do not need to give the schema name when creating a PostgreSQL temporary sequence. Erwin Brandstetter Erwin Brandstetter k gold badges silver badges bronze badges.
I get a syntax error. Postgres 9. No subquery allowed in a DDL command "utility command". See: stackoverflow. MitalPritmani: You may need type casts. Consider added instructions above. Show 2 more comments. Thank you! Last expression is exactly what I was looking for.
It allows me to reserve the sequence values in order to insert by batch afterwards. Andrzej Bobak Andrzej Bobak 2, 3 3 gold badges 30 30 silver badges 35 35 bronze badges. Below the text from link: Save this to a file, say 'reset. Example: psql -Atq -f reset. Salvatore Pannozzo Capodiferro Salvatore Pannozzo Capodiferro 9 9 silver badges 13 13 bronze badges. If the above statement doesn't work, you can use select currval 'schemaName. Sign up to join this community.
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How can I use currval to get the last inserted id? Improve this question. Jonas Jonas The use of currval is most definitely not discouraged. Perhaps it's a matter of opinion as to whether the use of currval is discouraged, but in certain cases users should be aware that it may deliver a value that isn't what you expect thus making RETURNING the better choice where supported.
In that case the currval function after insert on table A will return the number generated for the insert on table B, not table A. I'm with chander for safety. Perhaps your 'worst case' might be that you create some kind of log message with the wrong id value That could impact real people; e.
Or medical treatments. Add a comment. Active Oldest Votes. Or if you don't want to use the sequence name at all, use lastval. If the optional NO CYCLE key word is specified, any calls to nextval after the sequence has reached its maximum value will return an error. The OWNED BY option causes the sequence to be associated with a specific table column, such that if that column or its whole table is dropped, the sequence will be automatically dropped as well.
If specified, this association replaces any previously specified association for the sequence. The specified table must have the same owner and be in the same schema as the sequence. To avoid blocking of concurrent transactions that obtain numbers from the same sequence, ALTER SEQUENCE 's effects on the sequence generation parameters are never rolled back; those changes take effect immediately and are not reversible.
They will use up all cached values prior to noticing the changed sequence generation parameters.
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