length

Returns the number of characters in the string.

English manual coverage begins with PostgreSQL 7.1. Source history and runtime observations have their own recorded version boundaries.

Reading PG 18·Select a recorded version

7.1 7.2 7.3 7.4 8.0 8.1 8.2 8.3 8.4 9.0 9.1 9.2 9.3 9.4 9.5 9.6 10 11 12 13 14 15 16 17 18 19 20

group: string
group label: 字符串函数和操作符
lang: en
layout: table-new
pages: functions-string.html, functions-binarystring.html, functions-bitstring.html, functions-geometry.html, functions-textsearch.html
prose only: false

Definition PG 18

Returns the number of characters in the string.

Signatures and overloads

length ( text ) → integer → integer

Returns the number of characters in the string.

length ( bytea ) → integer → integer

Returns the number of bytes in the binary string.

length ( bytes bytea, encoding name ) → integer → integer

Returns the number of characters in the binary string, assuming that it is text in the given encoding.

length ( bit ) → integer → integer

Returns number of bits in the bit string.

length ( geometric_type ) → double precision → double precision

Computes the total length. Available for lseg, path.

length ( tsvector ) → integer → integer

Returns the number of lexemes in the tsvector.

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Complete source facts

documentation revision

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Source references

Original manual reference

Full definition and evidence JSON

Definition sources

center · PostgreSQL 18 · wiki-repair-20261023:41bc1e86b80d2b15f93e3ea873fbca42e2b5eae48f97bb5a74bf78c9fd334c31

Text language: en · wiki-repair-20261023:41bc1e86b80d2b15f93e3ea873fbca42e2b5eae48f97bb5a74bf78c9fd334c31