NULL | | 14. | CARDINALITY | bigint(21) UNSIGNED | YES | | NULL | | 15. | SUB_PART | bigint(3) UNSIGNED | YES | | NULL | | 16. | PACKED | varchar(10) CURRENT_TIMESTAMP (R) CURRENT_USER (R) CURTIME DATA DATABASE (R) DATABASES (R) DATE DATE_ADD DATE_SUB DATETIME DAY DAY_HOUR (R) DAY_MICROSECOND (R) DAY_MINUTE (R) DAY_SECOND (R) DDL DEALLOCATE DEC DECIMAL TiDB 的行为。 TiDB 允许 DATE 和 DATETIME 列中出现月份或者日为零的值，比如 ‘2009-00-00’ 或 ‘2009-01- 00’。如果这种日期参与计算，比如函数 DATE_SUB() 或者 DATE_ADD() ，得到的结果可能会不正确。 TiDB 允许存储零值 ‘0000-00-00’，有时候这会比 NULL 值更方便一些。 下面的表格里面显示了不同类型的零值： Date

Repository To abstract the database layer, Spring applications use the Repository interface, or a sub-interface of the Repository. This interface maps to a database object, such as a table. JPA implements Indexing. 4.5.4.6 Example Suppose you want the bookshop application to support searching for all books pub- lished in a given year. The fields in the books table are as follows: Field name Type Field description �→ | Table | Non_unique | Key_name | Seq_in_index | Column_name | �→ Collation | Cardinality | Sub_part | Packed | Null | Index_type | �→ Comment | Index_comment | Visible | Expression | Clustered |

"/migrations/**/*{.ts,.js}"], }); Note For TiDB Serverless, you MUST enable TLS connection when using pub- lic endpoint. In this sample code, please set up the environment variable TIDB_ENABLE_SSL in the Indexing. 4.5.4.6 Example Suppose you want the bookshop application to support searching for all books pub- lished in a given year. The fields in the books table are as follows: Field name Type Field description 366 | Table | Non_unique | Key_name | Seq_in_index | Column_name | �→ Collation | Cardinality | Sub_part | Packed | Null | Index_type | �→ Comment | Index_comment | Visible | Expression | Clustered |

"/migrations/**/*{.ts,.js}"], }); Note For TiDB Serverless, you MUST enable TLS connection when using pub- lic endpoint. In this sample code, please set up the environment variable TIDB_ENABLE_SSL in the Indexing. 4.5.4.6 Example Suppose you want the bookshop application to support searching for all books pub- lished in a given year. The fields in the books table are as follows: Field name Type Field description �→ | Table | Non_unique | Key_name | Seq_in_index | Column_name | �→ Collation | Cardinality | Sub_part | Packed | Null | Index_type | �→ Comment | Index_comment | Visible | Expression | Clustered |

"/migrations/**/*{.ts,.js}"], }); Note For TiDB Serverless, you MUST enable TLS connection when using pub- lic endpoint. In this sample code, please set up the environment variable TIDB_ENABLE_SSL in the Indexing. 4.5.4.6 Example Suppose you want the bookshop application to support searching for all books pub- lished in a given year. The fields in the books table are as follows: Field name Type Field description 347 | Table | Non_unique | Key_name | Seq_in_index | Column_name | �→ Collation | Cardinality | Sub_part | Packed | Null | Index_type | �→ Comment | Index_comment | Visible | Expression | Clustered |

"/migrations/**/*{.ts,.js}"], }); Note For TiDB Serverless, you MUST enable TLS connection when using pub- lic endpoint. In this sample code, please set up the environment variable TIDB_ENABLE_SSL in the Indexing. 4.5.4.6 Example Suppose you want the bookshop application to support searching for all books pub- lished in a given year. The fields in the books table are as follows: Field name Type Field description 367 | Table | Non_unique | Key_name | Seq_in_index | Column_name | �→ Collation | Cardinality | Sub_part | Packed | Null | Index_type | �→ Comment | Index_comment | Visible | Expression | Clustered |

functions: LPAD(), RPAD(), STRCMP() * Date functions: ADDDATE(string, real), DATE_ADD(string, real), DATE_SUB(string, real), SUBDATE(string, real), QUARTER() – Introduce the elastic thread pool feature to improve the control machine and the control machine itself. ssh-keygen -t rsa ssh-copy-id -i ~/.ssh/id_rsa.pub 10.0.1.1 4. Log in to the control machine using the tidb user account, and log in to the IP of the error task> to view more detailed information. For details about the query results, task status and sub task status of the query-status command, see TiDB Data Migration Query Status. 233 5.3.4.6 Step 5

Support pushing down the following date functions to TiKV #56297 #17529 @gengliqi • DATE_ADD() • DATE_SUB() • ADDDATE() • SUBDATE() For more information, see documentation. 40 • Support instance-level execution @AilinKid • Fix the data race issue in IndexNestedLoopHashJoin #49692 @solotzg • Fix the issue that the SUB_PART value in the INFORMATION_SCHEMA.STATISTICS table is NULL #55812 @Defined2014 • Fix the issue Indexing. 4.5.4.6 Example Suppose you want the bookshop application to support searching for all books pub- lished in a given year. The fields in the books table are as follows: Field name Type Field description

Support pushing down the following date functions to TiKV #56297 #17529 @gengliqi • DATE_ADD() • DATE_SUB() • ADDDATE() • SUBDATE() For more information, see documentation. 45 • Support instance-level execution @AilinKid • Fix the data race issue in IndexNestedLoopHashJoin #49692 @solotzg • Fix the issue that the SUB_PART value in the INFORMATION_SCHEMA.STATISTICS table is NULL #55812 @Defined2014 • Fix the issue Indexing. 4.5.4.6 Example Suppose you want the bookshop application to support searching for all books pub- lished in a given year. The fields in the books table are as follows: Field name Type Field description

incre- mental backups are com- patible with sub- sequent log backups. The default value is true, which means that incre- mental backups are com- patible with sub- sequent log backups. When you keep the default Indexing. 4.5.4.6 Example Suppose you want the bookshop application to support searching for all books pub- lished in a given year. The fields in the books table are as follows: Field name Type Field description �→ | Table | Non_unique | Key_name | Seq_in_index | Column_name | �→ Collation | Cardinality | Sub_part | Packed | Null | Index_type | �→ Comment | Index_comment | Visible | Expression | Clustered |