It turned out that many entries in the table 1 and table 2 had string_field column with NULL values. I thought that JOIN would keep records with NULL values because NULL is equal to NULL, isn’t it? Then I tried: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 SELECTNULL=NULL It ...
Extra中Using Index与Using Where,MySQL官方文档的解释如下:Using IndexThe column information is retrieved from the table using only information in the index tree without having to do an additional seek to read the actual row. This strategy can be used when the query uses only columns that are par...
SQL NOT EQUAL 运算符与 GROUP BY 子句 在上图中,我们可以看到排名 2 和 3 的计数分别为 2 和 2。 Also Read: EQUAL Operators in SQL 关于NOT EQUAL 运算符的要点 SQL NOT EQUAL Operator is a comparison operator denoted as != or <>. It returns boolean values i.e. True or False. It return...
"resulting\_condition":"multiple equal(1, \`tbl\_customer\_recharge\_record\`.\`customer\_id\`)"}\]}},{"substitute\_generated\_columns":{}},{"table\_dependencies":\[{"table":"
_NOT_FOUND、KINESIS_SOURCE_REGISTERED_CONSUMER_TYPE_INVALID、MALFORMED_RECORD_IN_PARSING、MALFORMED_VARIANT、MAX_RECORDS_PER_FETCH_INVALID_FOR_KINESIS_SOURCE、METRIC_STORE_INVALID_ARGUMENT_VALUE_ERROR、ROW_VALUE_IS_NULL、RULE_ID_NOT_FOUND、SECOND_FUNCTION_ARGUMENT_NOT_INTEGER、ST_DIFFERENT_SRID_VALUES、...
transaction with affected rows greater or equal to this value is considerated as big transaction 找出影响了n行数据的事务,默认500条 -databases 、 -tables 库及表条件过滤, 以逗号分隔 -sql 要解析的sql类型,可选参数insert、update、delete,默认全部解析 ...
For example, a isn't equal to ấ. If this option isn't selected, the collation is accent-insensitive. That is, SQL Server considers the accented and unaccented versions of letters to be identical for sorting purposes. You can explicitly select accent insensitivity by specifying _AI. Kana-...
/* In a unique secondary index we allow equal key values if they contain SQL NULLs 在唯一的二级索引中,如果包含sql NULL值 */ if (!index->is_clustered() && !index->nulls_equal) { for (i = 0; i < n_unique; i++) { if (dfield_is_null(dtuple_get_nth_field(entry, i))) { ...
Reorganizing also compacts index pages to make page density equal to the fill factor of the index. To view the fill factor setting, use sys.indexes. For syntax examples, see Examples - Rowstore reorganize. When using columnstore indexes, the delta store can end up with multiple small row ...
SQL*Loader automatically adjusts the value of read size to equal the value of MAX_RECORD_SIZE. SQL*Loader-00126 Invalid read size Cause: The argument's value is inappropriate, or another argument (not identified by a keyword) is in its place. Action: Check the command line and retry. ...