The storage requirements for table data on disk depend on several factors. Different storage engines represent【ˌreprɪˈzent代表,表示;(在竞赛或体育赛事中)代表(国家或地区);(标志或符号)意味着,代表着,标志着;描绘,(形象地)表现,描写;代理(个人或团体);代表(个人或团体)出席;】 data types and ...
13.6 Data Type Default Values Data type specifications can have explicit or implicit default values. ADEFAULTvalueclause in a data type specification explicitly indicates a default value for a column. Examples: CREATETABLEt1(iINTDEFAULT-1,cVARCHAR(10)DEFAULT'',priceDOUBLE(16,2)DEFAULT0.00); ...
As of MySQL 8.0.19, theYEAR(4)data type with an explicit display width is deprecated; you should expect support for it to be removed in a future version of MySQL. Instead, useYEARwithout a display width, which has the same meaning. ...
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When EXPLAIN is used with FOR CONNECTION connection_id rather than an explainable statement, it displays the execution plan for the statement executing in the named connection. See Section 8.8.4, “Obtaining Execution Plan Information for a Named Connection”. 当EXPLAIN与FOR CONNECTION connection_id...
For complete information regarding syntax and additional examples, see the description of theCAST()function. 有关语法和其他示例的完整信息,请参阅CAST()函数的说明。 Be aware of certain properties of date value interpretation in MySQL: 注意MySQL 中日期值解释的某些属性: ...
In MySQL 8.0.19 and later, you can specify a time zone offset when inserting aTIMESTAMPorDATETIMEvalue into a table. SeeSection 9.1.3, “Date and Time Literals”[8], for more information and examples. 在MySQL 8.0.19 及更高版本中,在表中插入TIMESTAMP或DATETIME值时,可以指定时区偏移。更多信...
In MySQL 8.0.19 and later, you can specify a time zoneoffsetwhen inserting aTIMESTAMPorDATETIMEvalue into a table. SeeSection 9.1.3, “Date and Time Literals”[8], for more information and examples. 在MySQL 8.0.19 及更高版本中,在表中插入TIMESTAMP或DATETIME值时,可以指定时区偏移。更多信息和...
Benchmarking Strategies Benchmarking Tactics Benchmarking Tools Benchmarking Examples Profiling Operating System Profiling3. Schema Optimization and Indexing Choosing Optimal Data Types Indexing Basics Indexing Strategies for High Performance An Indexing Case Study Index and Table Maintenance Normalization and Den...
typeCast: Determines if column values should be converted to native JavaScript types. (Default: true) queryFormat: A custom query format function. See Custom format. supportBigNumbers: When dealing with big numbers (BIGINT and DECIMAL columns) in the database, you should enable this option (Defa...