EC
1327
MySQLerrorstored-procedureshigh confidence

Subselect value not supported

Production Risk

Low — compile-time error; routine not created.

What this means

A subquery was used in a context inside a stored routine where it is not yet supported.

Why it happens
  1. 1Using a subquery in a cursor DECLARE on very old MySQL versions
  2. 2Specific unsupported subquery placement in routine flow control
How to reproduce
trigger — this will error
trigger — this will error
-- Context-specific; rare in modern MySQL.

expected output

ERROR 1327 (0A000): Subselect value not supported

Fix

Rewrite using a temporary table or variable

Why this works

Extract the subquery result into a variable or temp table before use.

Version notes

Sources
Official documentation ↗

MySQL 8.0 — 1327 ER_SP_SUBSELECT_NYI

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