Global variables can be used to calculate values in advance of their use and thus speed up performance and reduce complexity in other SQL entities.
在使用全局变量之前,可以使用它们计算变量值,从而可提升其他SQL实体的性能并降低复杂性。
Global variables can be used to calculate values in advance of their use and thus speed up performance and reduce complexity in other SQL entities.
在使用全局变量之前,可以使用它们计算变量值,从而可提升其他SQL实体的性能并降低复杂性。
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