Postgresql 中文操作指南
Synopsis
DROP OPERATOR [ IF EXISTS ] name ( { left_type | NONE } , right_type ) [, ...] [ CASCADE | RESTRICT ]Description
DROP OPERATOR 从数据库系统中移除一个现有的运算符。要执行此命令，您必须是该运算符的所有者。
DROP OPERATOR drops an existing operator from the database system. To execute this command you must be the owner of the operator.
Parameters
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IF EXISTS
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Do not throw an error if the operator does not exist. A notice is issued in this case.
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name
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The name (optionally schema-qualified) of an existing operator.
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left_type
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The data type of the operator’s left operand; write NONE if the operator has no left operand.
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right_type
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The data type of the operator’s right operand.
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CASCADE
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Automatically drop objects that depend on the operator (such as views using it), and in turn all objects that depend on those objects (see Section 5.14).
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RESTRICT
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Refuse to drop the operator if any objects depend on it. This is the default.
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Examples
移除类型 integer 的幂运算符 a^b ：
Remove the power operator a^b for type integer:
DROP OPERATOR ^ (integer, integer);移除类型 bit 的按位取反前缀运算符 ~b ：
Remove the bitwise-complement prefix operator ~b for type bit:
DROP OPERATOR ~ (none, bit);在一个命令中移除多个运算符：
Remove multiple operators in one command:
DROP OPERATOR ~ (none, bit), ^ (integer, integer);