# also correct; backticks on either object (in case it’s a keyword) ALTER TABLE child ADD FOREIGN KEY (parent_id) REFERENCES parent(`id`); 3.约束引用中的本地键、外部表或列有错字 如何诊断:执行show tables、show columns进行比较 如何解决:找出并修复错字 示例: # wrong; Parent table name i...
Creates an entry in thesys.serverstable (if there isn't one), marks the server entry as a Distributor, and stores property information. This stored procedure is executed at the Distributor on themasterdatabase to register and mark the server as a distributor. In the case of a ...
The name of the database in which to execute a Transact-SQL step.@database_nameissysname, with a default ofNULL, in which case themasterdatabase is used. Names that are enclosed in brackets ([]) aren't allowed. For an ActiveX job step, the@database_nameis the name of the scripting...
date_sub(string startdate,int days) --给定时间,在此基础上减去指定的时间段 6.CASE a WHEN b THEN c [WHEN d THEN e]* [ELSE f] END --当a=b时,返回c;当a=d时,返回e,否则返回f CASE WHEN a THEN b [WHEN c THEN d]* [ELSE e] END --当值为a时返回b,当值为c时返回d。否则返回e ...
答案就在org.apache.spark.sql.catalyst.expressions.Cast中, 先看 canCast 方法, 可以看到 DateType 其实是可以转成 NumericType 的, 然后再看下面castToLong的方法, 可以看到case DateType => buildCast[Int](_, d => null)居然直接是个 null, 看提交记录其实这边有过反复, 然后为了和 hive 统一, 所以返...
case REC_STATUS_SUPREMUM: ut_ad(n_fields == 1); n_node_ptr_field = ULINT_UNDEFINED; break; default: ut_error; return (instant); } } end = rec; if (n_fields != 0) { // 指向变长字段长度列表最后一个字节开始的位置 lens = nulls - UT_BITS_IN_BYTES(n_null); ...
Security Note:Selecting this check box stores the data on the user's computer when the form uses this data connection. If the form is getting sensitive data from this data connection, you may want to disable this feature to help protect the data in case the computer...
Data providers are the software components that allow the client — in this case SharePoint Designer 2010 — to communicate with the database. Originally, each database management system was unique, and each had its own programming language for accessing and updating data. ODBC was one of the ...
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BuiltInFunctionTableReference BulkInsertBase BulkInsertOption BulkInsertOptionKind BulkInsertStatement BulkOpenRowset CallTarget CaseExpression CastCall CatalogCollation CatalogCollationOption CellsPerObjectSpatialIndexOption CertificateCreateLoginSource CertificateOption ...